Jay Honeck wrote:

We have a Narco CP-136 audio panel, and a PS Engineering CD/Intercom. I'm
assuming the input jack has to "patch in" to the intercom somewhere.
(Frustratingly, a jack already exists for the back-seat passengers only.
It's a nice feature so that they can listen to their own music in back --
but we don't have the same option in the front seats.)

Yes, the usual place to wire in an audio input is into the intercom harness. You
need a schematic of the wiring plug pins -- this usually is part of the owner's
manual for the intercom.

The better intercoms have two sets of audio inputs; one for the front two seats
and the other for everybody else. Sounds like the original installer didn't hook
up the front set in your plane. I think you should be hunting for a manual. I
would contact PSE and see if I could get a replacement manual.

If you're determined to take it to a shop, I'd guess it'll be about 2 hours
work. Maybe a bit less. If the harness is tight and the plug hard to get to, it
could well be more.

George Patterson
"Naked" means you ain't got no clothes on; "nekkid" means you ain't got
no clothes on - and are up to somethin'.