Referral on replacing or repairing a shower stall

I have a leaking shower stall in a space occupied by a renter on the 3rd floor of Victorian Flatbush house. We have the ceiling below opened up so we can see the drain where it leaks and catch the water. We’ve had a plumber (John Hlad) look at it and attempt a quick repair by sealing the drain from above, but when it didn’t help he wasn’t interested in job if it required removing the shower stall and an unknown amount of work repairing walls, floor tiles, etc. I would like a recommendation of someone to fix the leak and replace the shower stall (and possibly close /repair the ceiling below). It doesn’t need to be a high end job, just leak-free and functional.