As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) ELECTRICAL ODOR IN REAR GALLEY. ENGINEERS DISCOVERED THAT AN OVERHEAD CABIN SIDE WALL BULB, 21B WAS BEGINNING TO SPARK AND SMOULDER, PRODUCING A PLASTIC BURNING SMELL, SIMILAR TO THE SAME ODOR EXPERIENCED BEFORE. BULB REMOVED AND SURROUNDING AREA EXAMINED. CBS TO SIDE WALL PULLED ISOLATING THE ROW OF LIGHTS. SIDEWALL LAMP HOLDER REPLACED.