There was leak at a tee way up in the vault ceiling. Everything else was fine including all drain piping underneath the floor – very lucky and, of course, good work too. I am getting tired of working in the crawl space. Some place is less than 2 1/2 feet height.
I replaced the whole tee and it should work fine. I will concentrate on the leak at an elbow of that small section. Hopefully, I can fix it without replacing all three elbows adjacently clustered together.
Note: Tomorrow, I will invite Rena to come down to the crawl space to look our piping system (drain and cold/hot water lines too) underneath. It will be the first time that Mom is down under. Oh, while working in the crawl space, I noticed that I have companions (mouse), we already caught three of them using CHEESE as bait. We even caught two together using just one spring trap. I don’t know how (?).