As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING DESCENT THRU 5000FT ON APPROACH. THE APU WAS OFF DURING EVENT SYMPTOMS FELT IN THE COCKPIT AND CABIN. RAM AIR INLET WAS OPENED BY THE CAPTAIN. . THE ODOR WAS STRONG. PERFORMED COCKPIT AND CABIN ODOR ISOLATION IAW TSM 05-50-00-810-831-A. RAN THE NR 1 & 2 PACKS INDIVIDUALLY USING APU, NR 1 & 2 ENGINES FOR 15 MINUTES EACH. NO ODOR NOTED. ACFT OK FOR SERVICE.