If you are hearing an arcing sound, more than likely It's on the AC side (not the DC side). First remove AC power from the RV. Then pull on each AC wire at the converter, as well each wire going out from the breaker panel (if it's nearby and might be the source of the arcing sound). Tighten the screw on any wire that is loose - or that pulls out!
If you don't find any loose wires, then the problem is probably inside the converter. If you know a good tech guy, he might be able to perform surgery on the converter. There aren't that many components on the AC side that could fail.
If the sound you are hearing is more like a very brief "tic", then the source of the sound would be on the DC side. You could also check for loose wires on the DC side - after also disconnecting the battery. A problem on the DC side inside the converter (assuming no loose wires were found) is harder to diagnose and you might end up replacing the converter in that case.