I live in a second floor condo and am not at all handy. For weeks, my toilet has been squeaking and squealing. I tighted up a screw in the tank and it stopped for several days, but it started up again this morning. I tried to tighten the screw again, but I couldn't get the squealing and whistling to stop. Does this sound like an issue with the fill tank valve? Also, my neighbors from downstairs called, and something in my bathroom is leaking. The water spot is not directly under the toilet, sink or shower. Is it possible that the fill tank valve issue is now causing the leaking? Please help!! Thanks very much.