The short answer? Apparently. During my buddy box training both my instructor and I experienced some weird and unpredictable elevator responses from my Goldberg Eagle 2. It would go from barely enough authority to land to huge overreactions causing straight up verticals. We changed transmitters, physical linkage and transmitter trims, and even switched servos out with no results. The behavior was intermittent and unpredictable. Since we had eliminated transmitters and servos as the issue, we were down to something in the crystals or the receiver or (less possibly) the receiver battery. The receiver was a Futaba 127DF and was new with the plane in July 2006. In November another member of the club loaned me a spare 127DF. We put it in with my old channel 22 crystal...and the problem disappeared. The plane became gentle and predictable. The receiver was under warranty so I sent it back to Futaba with an analysis of what we had done. While they did not tell me what their test of the receiver found, a couple of weeks later UPS delivered a New In Box 168DF from them with no charge (I think the 127 is no longer made). So while I can't 100% say a single channel on the receiver failed (perhaps through the connector or board), circumstantially both my instructor and I are fairly certain it did.

Dump the receiver. It isn't worth the lack of confidence you will have trying to use it again and not knowing for sure what is going on.