As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: MILD/MODERATE TRANSIENT DIRTY SOCK SMELL AFTER TAKEOFF IN FRONT HALF OF AIRPLANE. DISSIPATED AFTER 2-3 MINUTES. DID NOT RE-OCCUR IN FLIGHT. REOCCURRED ON TAXI-IN. **SUPPLEMENTAL REPORT FOR AALA202304211306: MAINTENANCE FOUND APU TO BE SOURCE OF ODOR. AFT BEARING OIL RETURN LINE LEAKING AT FITTING. APU REPLACED PER JOB CARD 08L30049001.** (CLOSED)