As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: DURING CLIMBOUT BELOW 10,000 FT. A MILD/TRANSIENT DIRTY SOCK ODOR WAS PRESENT IN BOTH FRONT AND AFT SECTIONS OF THE AIRCRAFT. ODOR DISSIPATED BY 10,000 FEET BUT WAS DETECTABLE AGAIN BELOW 1000' ON LANDING BUT VERY FAINT. MAINTENANCE ISOLATED THE SOURCE OF THE ODOR TO THE APU. **ORIGINAL REPORT WAS AALA202311086628: MAINTENANCE FOUND THE APU OIL LUBE MODULE AND THE APU FUEL CONTROL UNIT (AALA202312186217) LEAKING AND REPLACED BOTH UNITS. A SATISFACTORY LEAK / OPERATIONAL CHECK WAS ACCOMPLISHED.