Are there leaks and water penetration Issues In This Property?

[missgreeneyes]

Thanks HandyAndy.
Really appreciate input from more experienced people like you. I only learnt how to use a caulking gun and put silicone around edges about a year ago! Ha!

In a nutshell, is high pressure where water is held at the mains pressure (the type of pressure that sends geysers up when the fire engine knocks over the red hydrant in the movies, riot-crowd-fighting water-cannon pressure).
Low water pressure is 'modulated' high water pressure. So the taps and plumbing inside the wall take the pressure down, leaving enough pressure so water can still spurt out the taps, but not enough to knock you over.
Correct?

I tried to find a pic of the shower stall and couldn't. I think I may never have taken one. I'll take one when I go to the property this wednesday with the plumber.
I am experiencing technical difficulties loading a picture of the bathroom. The walls are not tiled up to the ceiling. I think the tiles come up to...under 2m up the wall? Possibly up to the 1.6-1.75m mark, max?
I'll try to load a pic again later.
I agree with you about the strata/plumber randomly hacking!!! Too bad I didn't know any better.

The paint seems to bubbling starting from halfway down the wall. Somewhere....above the taps but below the shower head???

OK, OK, I think you know better than the plumber. What do you suggest please? I will go through the plan step by step with the plumber.
Speaking of, I'll call them and ask them to bring a stethescope. They will be doing a pressure test but may not think about the stethescope.
I spoke to them on the phone and they think it's not the pipe leaking, or there 'would be water all over the place'. They think it's an issue with the waterproofing in the wall.
I do not want to re-waterproof the wall this time, then have to go through this saga again in a year's time!!!! How can I ensure they get to the root of the problem this time???

 

[missgreeneyes]

Update:
Plumber came today. Took one look and said it was a leaking tap. He said no way it was failed waterproofing, or the whole wall from the showerhead downwards would be bubbling (I view this statement with some scepticism).
The bubbling starts from tap-level, downwards.
Plumber took off the taps and flanges and said water was pooling behind the flanges and leaking down the wall.
He siliconed the gaps under the flanges - between the holes in the concrete where the spindles sit and the spindles themselves.
FYI, missgreeneyes aka missitchyfingers tried to put in brand new taps+spindles at the time of the shower base repair. The plumber took the taps off at the time. By taps I mean the white plastic covers you grip with your hands to turn the water on and off (I think he did it to prevent anyone from taking a shower while the waterproofing dried). When it came time to put the taps back on missitchyfingers had the idea of putting new taps+spindles in at the same time. New spindles didn't fit (too long), so old spindles and taps went back on. I think they weren't put back on properly, leaking to some leaking and this saga....

The plumber said now I need to burn/strip off the bubbled paint, and wait a whopping 6 month minimum for the wall to dry out, then paint it back. Time can be shortened by running a heater (never mind that, won't bother the tenants with that).
The repaired shower base doesn't look that bad, as the original tiles were a light colour. I shouldn't have had that base done on hindsight, since HandyAndy said (and I agree with the logic behind his argument) there wasn't a leak.

Is there a way to paint the tiles all the same colour? You can see the repaired base in the pic. On hindsight again I should have bought my own replacement tiles from a specialist tile shop.

Will this repair devalue my property, because people will look at the base and think 'Oooh, it's had problems in the past. Maybe this property has serious problems with the plumbing'.

Also, apart from at Bunnings, can anyone recommend any 'tradie' courses out there? I'd like to learn some plumbing and handyman stuff. Electricals I'm a bit chicken to touch right now but maybe someday.

Thank you everyone for your input and support.