As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: PILOT REPORTS DIRTY SOCK SMELL WITH PACKS ON GND & CRUISE. MAINTENANCE FOUND SOURCE TO BE FROM APU. ***SUPPLEMENTAL INFORMATION: MAINTENANCE REMOVED AND REPLACED APU OIL COOLING FAN IAW AMM 49-52-51 AND ACCOMPLISHED APU WASH IAW AMM 49-00-00-100-001-A. OPS GOOD, NO LEAKS FOUND.*** (CLOSED)