Hey, guys, I own a Sony STR-DE835 AV Receiver. Over the past few years, the volume knob has sometimes frozen and couldn't be moved with the remote control (new batteries). I've used compressed air around the prong the knob fits over to clean it, but it never fixed the problem. Sometimes I could just jiggle the knob and then could use the remote, but sooner or later it would freeze again. Well, I think I've jiggled it one too many times and now the prong is loose. I'm considering having the receiver turned over to a repair shop. In the past, I've never had to have a piece of equipment repaired and am just wondering if there's anything I might need to know about repair shops beforehand. Thanks guys!