I had replastered where the damage was on the first floor ceiling, so right now, I can't tell if the latest water efforts had caused a leak again. I would have waited until the plumbing was resolved, but my mother-in-law was coming over and I didn't need one more thing pointed out that was wrong with the house :)
I'm off Monday, so I am going to cut an access panel inside the closet that is next to the shower stall. Hopefully that will give me a better view of backside of the shower valve.