My Cary SLP-05 volume control does not work


 My preamp has been boxed for 3 years and when I hooked it up there is volume to the speakers but the volume control does nothing to raise or lower the volume and the remote does nothing. An ideas?

128x128knorpi
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I think @viridian nailed it. 

Do the two balance volume pots change the output?  It would be unusual for both the main and  the two balance pots to not work.