As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
JUST BEFORE PUSHBACK NUMEROUS PASSENGERS COMPLAINED OF A BURNING ODOR IN CABIN. MAINTENANCE FOUND OVERHEAD LIGHT SOCKET ABOVE PAX SEAT 20DE BURNT AND PLASTIC STARTED TO MELT. THIS WAS THE CAUSE OF BURNING SMELL. LIGHT SOCKET PN BV04055N-01-84 NIS IN ATL. OVERHEAD LIGHT WAS DISCONNECTED, CONNECTOR STOWED, BULB REMOVED, AND WAS FORWARDED TO MCO/PLAC AT SEAT 20DE. CURRENTLY ON MCO.