As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FUME EVENT ON ARRIVAL @ 12,000' ISOLATED TO PACK 1 IN AIR OCCURED AGAIN ON THE GROUND AFTER SHUTDOWN WITH APU BLEED ON-TROUBLESHOOTING DONE IAW TSM 05-50-00-810-831-A, AND CONFIRMED PACK1 AS SOURCE OF CABIN ODOR. SEE L/P 3251057-2 FOR PACK DEFERRAL