As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PHX - BURNING SMELL - FLT 0534 - EN ROUTE FROM SAN TO PHX AN ACRID BURNING SMELL WAS NOTICED IN PROXIMITY OF SEAT ROW 17 L/H. MAINTENANCE FOUND CEILING LIGHT BALLAST BAD ABOVE SEAT ROW 17 L/H, REPLACED CEILING LIGHT BALLAST ASSEMBLY IAW AMM 33-21-09, OPERATIONAL CHECK WAS GOOD.