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 PASSING THROUGH 6 THOUSAND FEET 0010Z. C/W J/C 26L0021001 AND SUSPECT APU TO BE SOURCE OF THE ODOR, FCU LEAKING OIL EXTERNALLY. ***SUPPLEMENTAL ACTION SECT 4: COMPLIED WITH APU SMOKE ODOR FUMES TROUBLESHOOTING IAW J/C 26L00021002. NO EXTERNAL LEAKS OR ODOR NOTED.***(CLOSED)