As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PHL - DURING FLIGHT, FLIGHT ATTENDANT REPORTED A SMELL OF A VERY HOT LIGHT BALLAST. SMELL EVENTUALLY STOPPED. FLIGHT CONTINUED AND LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE FOUND SEAT ROW 4DEF SIDEWALL BALLAST INOPERATIVE. REMOVED AND REPLACED SEAT ROW 4DEF SIDEWALL BALLAST PER AMM 33-212-32. OPERATIONAL CHECK GOOD.