My TSL602 has some strange volume control problems

EADGBE

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When the amp is on the red/lead channel its own volume control doesn't work. Instead the yellow/crunch channel's volume controls its volume. This hasn't happened before. I've owned this amp for twenty-two years. Could this be caused by a bad filter cap allowing DC on the volume pot etc.?
 

Spanngitter

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Check if all your control voltages are present (+/-15Vdc, 24Vdc) as these are imminent for proper switching
See below pic from Schematic I found once in a different forum and which helped me already in the past (blown Zener)
voltages.png
 

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