As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHIP 3308 ODOR ON APU START AND DESCENT THRU 10K FT. CORRECTIVE ACTION: METALLIC SMELL NOTED AFTER PACK 1 IS STARTED THEN QUICKLY DISSIPATES. OPENED DUCT BETWEEN ACM AND REHEATER AND NOTED STRONG SMELL AT ACM TURBINE INLET. NO SMELL AT HEATED FLOOR PANELS OR APU START COMPONENTS IN BULK CARGO. REPLACED PACK 1 ACM. (7338562)