As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT ATTENDANTS REPORTED A FAINT ODOR, POSSIBLY OIL. DURING CLIMB, ODOR WENT AWAY AND ONCE AGAIN WAS PRESENT DURING DESENT. ODOR WAS FAINT IN COCKPIT AND STRONGER IN THE FORWARD GALLEY. MAINTENANCE TROUBLESHOT AND FOUND SOURCE OF ODOR TO BE APU AND PERFORMED 26L00021002. MAINTENANCE REPLACED THE APU OIL COOLER IAW CARD 26L31049004. REPLACED THE COOLING FAN IAW MM 49-52-51. REPLACED APU TURBINE VENT TUBE PACKING IAW MM 49-91-53 AND PERFORMED SATISFACTORY OPERATIONAL CHECKS.