Must be some cold solder joints the cover is pushing on the PCB where they are located.
Remove the cover, play a tape and gently tap around the PCBs with the back of a screwdriver. You’ll eventually locate them.
Just needed a little of the old Fonzie method.
Fonzie
Please don’t compare me with that manlet sweaty jew rat.
No comparison intended, can’t help but associate percussive maintenance with the character.
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