As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT RETURNED TO ATL AFTER CABIN CREW REPORTED SPARKS AND A STRONG ELECTRICAL SMELL COMING FROM AN OVERHEAD LIGHT ASSEMBLY. CABIN LIGHTING WAS TURNED OFF. MAINTENANCE FOUND ROW 20ABC WIRING BURNED. REMOVED BURNED WIRES AND RE-PINNED PLUG IN PSU. RESET CIRCUIT BREAKER AND OPERATIONAL CHECK WAS GOOD.