Sony vintage CDP-7F CD player 1980s working, but has Headphone Volume Crackle…

Description

Sony vintage CDP-7F CD player 1980s working, Has Headphone Volume Crackle…. Condition is "for parts or not working", due to headphone volume not functioning properly. USA 120VAC plug.
Unit shows wear and tear as shown, including small dents/pits on top and front edges and surfaces; these don’t affect performance, but some buyers may be looking for a pristine unit, this is not pristine.
As stated in title, turning the headphone volume control produces ‘noisy volume’, with one channel sometimes louder than the other. Not sure if it needs a cleaning or what - this doesn’t affect the main rca outputs, they work as intended.
This is a classic piece of vintage CD gear. I tested all the buttons, and all are work including the memory function.
Please ask questions before bidding, no returns on this vintage item, as I’ve described, the headphone volume is not functioning as intended.