Not likely! Suggest swapping input connection, red RCA connector to white and white to red and see if problem swaps speakers.
If still left channel bad swap speakers left to right see if problem follows speaker.
Check balance adjustment and confirm that it is set to the middle!
Check all other inputs and confirm always no left output.
The goal is to confirm that the left channel is defective!
The service manual is MS3102101 would normally be available from Radio Shack.
Check for defective capacitors or failed solder joints on the PC board. These units are repairable even by DIY however replacement recievers are relatively inexpensive.
Hope this helps?
