What was found
AIRCRAFT WAS GROUNDED: FUME EVENT, AT ABOUT 12 MILE FINAL, 3000 FT FLIGHT ATTENDANTS IN THE REAR REPORTED AN ELECTRICAL SMELL FOR 5 MINUTES WHICH EVENTUALLY CLEARED AFTER SELECTING BLOWER AND EXTRACT TO OVRD. MAINTENANCE FOUND AFT GALLEY RH WORKING LIGHT BALLAST DEFECTIVE/BURNT AND REPLACED BALLAST IAW AMM 33-21-11.