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 ODOR NOTICEABLE IN FLIGHT DECK MOSTLY ON APPROACH. AFTER TURNING OFF PACK 1, SMELL IMPROVED. WILL COMPLETE LONG ODORFORM SHORTLY. PERFORMED ODOR TROUBLESHOOTING JOBCARD 26L00021001. FOUND EVIDENCE OF OIL LEAK AROUND APU OIL PUMP AREA..PLACED APU ON MEL REF MIC#1045100. **SUPPLEMENTAL REPORT FOR SDR AALA202503178143.**(CLOSED)** MAINTENANCE REPLACED APU IAW J/C 26L31049003.