tu-217 bad left channel?

Did you swap the leads around to be sure?
Try it on a different amp? Or at least on Aux?
Try different RCA cables too.
 
I am not familiar with that model, but here's what I would do.
Got the service manual? Read it and see if there's a troubleshooting chart.
Then open it up and do a close visual inspection, look for any overheating, loose wiring, damaged components.
Check any fuses with a VOM.

Did you clean the controls with deoxit?
 
Try exercising the AM/FM switch - it could have oxidised contacts - the DeOxit (as nosirrah has suggested) will help with a permanent cure if this is the problem.
 
Switch So 1 ( sections a-f ) in the AM/FM switch... the " stereo " outputs to the rear of the chassis run through that switch.... Probably needs a little spritz of cramolin ( cleaner ) and a good working of the switch to get it going again....
 
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