As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INSPECTION TYPE:N/AVERY NOTICABLE BURNT OIL SMELL BEING EMITTED BY PACK SYSTEM. ODOR SEEMED TO BE CONCENTRATED IN "EYEBALL" TYPE VENTS AT EACH CREW POSITION. ODOR BEGAN AT TOP OF DESCENT INTO ONT.ACCOMPLISHED CLEANING OF AC PACK & DISTRIBUTION DUCTS FOR ODOR. REPLACED COALESCER BAGS. CHECKS OK. REF MM 21-54-05 & MM 21-53-00.