As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT CREW REPORTED ELECTRICAL SMOKE MID CABIN. DIVERTED FLIGHT TO LAS VEGAS AND LANDED WITHOUT INCIDENT. MAINTENANCE DEPARTMENT PERSONNEL REPLACED TWO LIGHT BALLAST AT SEAT ROW 16 AND 17 DEF, AMM 33-21-03. SYSTEM OPERATION CHECK NORMAL. AIRCRAFT RETURNED TO SERVICE.