Weird hum issue - only on In 1 Left (rear)

Poparad

Power User
I've been having a weird issue with hum, but only on In 1 Left. In 1 right, In 2 L and R, and the front input are fine. The hum is kind of intermittent, but usually shows up after I've had the unit plugged in for a few minutes. It's happened in several different places, so it's not just the wiring in my apartment. Could I have a bad jack?
 
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