[rnln]

I have been thinking of repairing one of my shower tiles for a while but have not have the gut to start. If I don't, I am wasting a whole shower in my house.

Basically, I see tiles cracks on the floor pan and a long the surrounded walls, proximately 2" above the floor. Once, I blocked the drain and poured couple gallon sof water in there. I saw bubbles for couple seconds, then it's stop. Water stayed tight for 2 days before I drained it off. So I guess the pan still seals well. But the way it cracks makes me think the concrete floor is damaged. What do you guy think? Should I just replace tiles and be happy with it, or should I redo the concrete floor and walls before I redo tiles? Or should I knock out all the tiles before making decision?