I had a 200 GTL come in with a goofy receive issue. After unkeying, the receive would "wobble" in and out, almost like an antenna whipping back and forth next to a stack, causing the signal level to drop way down and come back up again. After some head scratching and tapping here and there, it seemed to track to the general area of the receive coils. I touched them up, and same problem. I finally tried tapping on the relay (dont know why I didnt try taht first....), and that seemed to be the problem. I swapped it out, and that took care of it. Just wanted to post the symptoms and the cure for anyone who runs into a similar problem.