It's going OK, I guess.
I just took a peek at the schematics for a 3440 transport, which should be very similar to yours and didn't see any relays in that part of the circuitry that controls the transport, so any clicks or clunk sounds you're use to hearing in there might just be the brakes or the solenoid to move the pinch roller in or out. So yeah, most likely, just a grimy connector, maybe even pin 7 of that harness, which is the ground connection for all the transport buttons on that separate transport button board or the wire harness that connects it to the transport control board.
Good luck!
Cheers!