I'm doing some work on my parents home 200+ year old farm house...

OK, I just replaced the entire tub and shower assembly (Moen model L82694) because it was leaking and annoying mom... The problem is it's still leaking in the tub... I am far from a plumber but growing up in the house had to learn, so I am capable of replacing the old with new but thats about the extent of my knowledge...

I don't know what type of faucet (ball, disc, cartridge, and compression) it is a single handle, the box doesn't tell me much, the faucet still leaks...

Any ideas are appreciated, I have taken it aprat once to make certain it was all assembled correctly and tight..