Leak from upstairs shower drain
My house is about 2 years old and the original owner had an extra upstairs bathroom installled by a plumber rather than the builder. The shower is used infrequently and I noticed a leak on the first floor ceiling today. Should I expect the plumber to honor the work after a 1 1/2 years and prior to my purchase? Should I trust the plumber since they didn't get it right the first time or search for a new one?
I unscrewed the chrome drain cover and noticed the white PVC pipe moves up and down several inches. It seems like the pipe needs to be stationary so that the brass ring creates a good seal against the rubber gasket. I'm thinking because it's a fiberglass tub that even if I tightened down the ring when someone steps in the tub, the pipe would move down slightly thus creating a leak again. I'm trying to avoid cutting into the ceiling drywall until I figure out the next course of action. Any assistance would be greatly appreciated.
Thanks,
WR