Ell- I have been thinking about the best way to do this and I am still confident that I will be able to do this myself. I am wondering about what you said about the wall... The wall does appear to rest on the floor in this area. However, the joists run perpendicular to this wall. Am I supposed to move the kitchen cabinets in order to lay new plywood over the two joists (there is one in the bathroom and the other is in the kitchen)? Or can I install blocking between the joists for the wall to sit on?? Part of the subfloor under the tub (in that corner) has been cut away. I don't know when, possibly by the plumber I hired to fix the leak in the tub drain. Is it necessary to replace the subfloor in this area? Or will the blocking under that edge of the tub be enough?? I have noticed (from under the house) that there is a drip from under the toilet. I can't tell if it is coming from the flange (wax seal??) or from where part of the connecting pipe has broken away. Other than re-caulking the tun, I can't think of where else I would be leaking. What are your thoughts?