This might be a pretty stupid question, but I wanted to get a straight answer on it.

Here's the deal, I've got a Denon AVR-1601 receiver with SEA 4.0 series speakers. A few weeks ago the front right speaker started getting really staticky, and then stopped putting out a signal all together except for a low buzzing that's the same no matter what the volume the receiver is at. This happened for about a day or two, and then everything was back to normal. Last night, however, it cut out again and hasn't come back.
My question is, is the channel output on the receiver just dead? Or is there some other potential problem?
Is there anything that I can do to fix it? (bring it into a repair shop...perhaps fix it myself, I have a reasonable amount of experience tinkering with electronics..soldering etc, just not much with audio equipment).

Any help would be greatly appreciated.