re: P trap help - how would you repair?

If you have a hacksaw or sawzall, use it to remove ftg "A" by cutting through pipe "B" and leave as much of pipe "B" intact as possible. You want to get rid of that 90° while leaving as much of pipe "B" as you can.

The side of your blade should be touching "A" while you are cutting through "B". Then follow the steps from above with a coupling to repipe.

This will give you a trap adapter where ftg "A" is currently, and will allow you to use a SJ p trap instead of a glued trap.