As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: DIRTY SOCK SMELL/ODOR REPORTED BY CABIN CREW AT THE TOP OF DESCENT INTO BJX. ODOR WAS STRONG THROUGH OUT CABIN AND COCKPIT UPON GATE ARRIVAL. MAINTENANCE ISOLATED THE SOURCE OF THE ODOR TO THE APU AFTER FINDING HEAVY OIL CONTAMINATION IN THE APU INLET. ** SUPPLEMENTAL REPORT FOR AALA202305199481: MAINTENANCE REPLACED THE APU PER TASK CARD 26L31049003.** (CLOSED)