As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING MAINTENANCE BASE VISIT FOUND THAT THE EXIT MARKER SERVICE DOOR AND GALLEY CEILING PANEL SERVICE DOOR LIGHT WOULD NOT COME ON. THE AIRCRAFT WAS REMOVED FROM SERVICE. FOUND CONNECTOR P8530 TO BE LOOSE, INSTALLED CONNECTOR IAW SWRM 20-50-03. THE AIRCRAFT WAS RETURNED TO SERVICE.