Open the wall up.
Find out what is in there and what kind of pipe was used.
The "typical" layout is a San TEE with the vent connection
directly on top and drain below. (There are lots of other
If that's what it looks like, turn the TEE 90 deg left or right
and add a 10" length to the inlet of the TEE and an EL on the
Of course, you can't *actually* turn the TEE, so best to saw
a section out and use 2 No-Hub couplings to put a new TEE in place.
Buy a basic plumbing How-To book to get a better idea of what's
involved. Watch out for framing members that may be in the way.
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