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I can't answer your question directly, but if your bathroom is on a second floor, you could open the ceiling of the room underneath and possibly get a hint about the location of the leak. Or if it's on the ground floor and you have a crawl space, cut holes in the plywood subfloor from underneath, insert a boroscope into the holes, and then cover up the holes.
Good luck. Shower leaks are insidious. Two years ago I gutted our master shower and specified whole-slab panels for the shower enclosure and a pre-cast stall floor. Installation is very difficult but now I have a minimum of seams to look after instead of many linear feet of grout lines.
I assume they are talking about a Thermal imaging camera? I had a difficult to find water leak a few years back, just started cutting holes in walls below the shower until we found the source, I think it was 6 holes in total. The idea to use a thermal camera is a good one, wish I had done that. Also a good camera/ endoscope will be helpful.
We have a tile shower, so short of removing the cover over the shower valve and examining the drain, not much you can do and easily repair (for a DIY'r like myself). Removing dry wall and repairing was a lot simpler for me.
1. Check around all fixtures coming through the shower wall and look for exposed openings where water could enter and seal them with caulking.
2. If the shower has ceramic tiles with grout then check for cracked tiles or loose grout especially in the shower floor area.
3. Plug the shower drain and allow the shower base to fill with water and check for leaks. If it leaks with the drain blocked then the shower pan has a leak. If it doesn't leak, then unstop the drain and check for leaks again which will test the drain pipe. Check the seal around the drain opening as well.
With a bit of detective work you can narrow it down where the leak is and don't need all the fancy equipment to find it.
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