Hi All, I have a Crestwood Jukebox and have discovered the left channel is not working properly. If I disconnect the right speakers and sub I can very faintly hear a very tinny sound coming from the left speaker. . I have swapped left and right inputs into the amp and the left is still faulty. I have taken the amp out and nothing seems burnt out. The balance control does not seem to work either. When turned full left sound still comes out of the right speakers. The amp is a R-2179A. I have connection from the test RCA plugs to a home theater system and only the right channel can be heard. Any help would be much appreciated.