Brake Light Mystery

Ok, 2017 CX-3, one brake light is out but turn signal works (same single filament amber bulb).

Bought new bulb, brake light still not working.

Switch bulb from other side that works, still no brake light.

Cleaned inside of socket with electric circuit cleaner, metal contacts inside socket intact and in-place.

This has me stumped, before I have to bring it to a Mazda dealer, anyone have any input?

Thanks.
 
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