What was found
SOON AFTER GEAR EXTENSION ON APPROACH THE CAPTAINS' SIDE AFTLAVATORY SMOKE DETECTOR WENT OFF. A THIN WHITE HAZE WAS VISIBLE THOUGH OUT THE CABIN ALTHOUGH THE SMELL WAS WORSE INTHE AFT CABIN. THE FLIGHT ATTENDANTS DESCRIBED THE SMELL AS AN ELECTRICAL IN NATURE. MAINTENANCE ACCOMPLISHED OPN 5088 AND TROUBLESHOT FOR SMOKE/ODOR. APU WAS CONTAMINATED WITH HYDRAULIC FLUID. OPN 5090 ALT DUCT BURN OUT ACCOMPLISHED.MAINTENANCE FOUND RUDDER SHUT OFF VALVE LEAKING FLUID. VALVE WAS REPLACED WITH BORROWED PART FROM AMERICAN AIRLINES. (2010-D1373) (DLM88103220)