Hi all. My 8-9 years old house already have leak at the toilet. It's affecting the opposite side of the wall.

The contractor gave us 2 suggestion.

1. Just do external piping. Easy. - wife don't want

2. Hack the tiles to try to find the leak. Problem is i contacted the tiles supplier they don't produce those tiles anymore. So it will be weird if I use a different tiles on some spot.

You guys face this situation before? 

Are there any smarter way to do it? Or maybe different tiles design solution?

Thanks.

Whole spot is whole wall jor lor. Lol. So 3 side looks the same,  one side looks different.

Lol. Out of the question lor. . 3 toilet lehhh..