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Terk is right. How did you block the water? You can rent a balloon type drain tester (10-20 bucks) from a plumbing supplier and plug the drain and then fill with water. Put a mark on the wall or use a stick to see if any of the water has gone down any to see if the pan has a leak after 24 hours. If you can go underneath, you will see traces of water under the pan. If not, then you are good to go and tile away.
Lets say you pan is good, what do you want to do? How long will you stay in that house? I am a big fan of ripping everything out and start over just because I know it will be done correctly. If not, chip away with an air hammer and only remove the tiles only and not the concrete in the pan. I would do the walls also. Dealing with the crack is the PITA.
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