What was found
ABQ - DIVERSION - FLT 0081 - WHILE ENROUTE FROM PHX TO BWI FLIGHT CREW RECEIVED MULTIPLE REPORTS (6+) OF AN INTENSE ELECTRICAL BURNING SMELL IN THE CABIN CENTERED AROUND SEAT ROWS 15-18, SMELL PERSISTED FOR 5-7 MINUTES, PASSENGER ENTERTAINMENT SYSTEM WAS DEACTIVATED, AND AIRCRAFT DIVERTED TO ABQ. MAINTENANCE INSPECTED THE PASSENGER SERVICE UNIT, CABIN LIGHTING BALLASTS, AND SEAT ELECTRICAL BOXES IN AND AROUND SEAT ROWS 15-18. BOTH PACKS WERE OPERATED USING APU AND ENGINE BLEED AIR, PASSENGER ENTERTAINMENT SYSTEM WAS ALSO OPERATED, NO BURNING SMELL OR ODOR WAS NOTED. MAINTENANCE FOUND A BAD BALLAST FOR CABIN LIGHTING AT SEAT ROW 19. PROBLEM WAS DEFFERED PLACED ON MEL 33-20-01, CONDITION 1, CABIN SIDEWALL LIGHT I