What was found
AIRCRAFT WAS GROUNDED: FLIGHT ATTENDANTS REPORTED FAINT ODOR, POSSIBLY OIL ON CLIMB. ODOR WENT AWAY AND ONCE AGAIN WAS PRESENT ON DESCENT INTO TUS. ODOR WAS FAINT IN COCKPIT AND STRONGER IN FORWARD GALLEY. MAINTENANCE TROUBLE SHOT "TOP OF CLIMB" 26L00021001 AND FOUND SOURCE OF ODOR TO BE APU AND PERFORMED JOBCARD 26L00021002. MAINTENANCE REPLACED APU OIL COOLER PER CARD 26L31049004. REPLACED COOLING FAN (SEE AALA201804119022) PER MM 49-52-51. REPLACED APU TURBINE VENT TUBE PACKING (SEE AALA201804119023) PER MM 49-91-53 AND PERFORMED SATISFACTORY OPERATIONAL CHECKS.