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Old 7th August 2020
  #2
Lives for gear
 

With all external cables disconnected, use an ohm meter to measure resistance between ground and cold on your problem channel. If your meter indicates a short, or anything other than a fully "open" condition, do a careful visual inspection of both the DB25 and the TT jack. It might be a solder blob, mashed wire, a small part that fell into the bay, reversed wires, bent contact, etc.