It might be that one side of front panel (the side with red LEDs) touch a bit the metal opening shorting the LED therefore lighting them up. Could you trip to loosen a bit the 2x screws holding the front panel, then push a bit back the PCB, then tighten again the screw. Otherwise putting a piece of tape on the PCB side that touch the metal opening, to isolate the LED, could help.   For next batch we will have to increase more the gap because mass production doesn't seem to me
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