Reverse light fuse

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Any idea if this green slip is the reverse light switch?
 
Bulbs look good not checked volts though
Bulb can be damaged, even it 'looks' good.
Also on this, multi-meter tells you the reality. Or wrench/screwdriver/battery/ can be used to check the bulb.
Basic principal, to check voltage and bulb first, before checking a fuse...
 
Tried 3 bulbs, volts and wiring looks good, parking sensor works, reverse bulb doesn’t? Could it be reverse switch then but I didn’t think parking sensors would work if switch is faulty?
 
... wondering if it’s the bulb holder?
Now when you mentioned, it could be damaged ground connection on galvanized metal 'circuit board', which is holding bulbs.
I added additional ground wire to mine right rear turn signal years ago, and turn bulb started to work normally.
 
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