Originally Posted by DannyT
does your drain have the trip lever on the back of the tub to stop the tub up or was it just a plain cover on the back of the tub and the stopper was on the drain in the bottom? what is on the other side of the wall behind the tub?
Yes, it's the trip lever that moves a plastic plunger up and down. I did notice that when I re-installed the trip lever mechanism, the plunger would not go down initially (lending credence to the fact that there was a solid obstruction). While snaking it, I might have pushed it further down the P-trap since the plunger now moves freely.
I pulled the plans to my house and it showed a 24" by 24" plumbing panel behind the tub which is in the master bathroom. Unfortunately this panel does not exist. The builders probably did not install one. I'm amazed that a plastic P-trap has no access. What happens if it has to be replaced? It must be 47 years old!!
I will try to see if I can buy some sort of auger with a clamp or something like that on the end and see if I can somehow grab onto the obstruction and pull it out. I might have to cut an access panel from the master bathroom but really do not want to mess up the wall if at all possible. A tool with a camera at the end (Ridged makes them) is an option but that will let me see the obstruction, not remove it.