As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HAD A FUMES IN THE CABIN, THE AIRCRAFT WAS GROUNDED. MAINTENANCE ACCOMPLISHED JC 26L00021001 TROUBLESHOOTING AND FOUND AFT CARGO COMPRESSOR VENT EXTRACT FAN AT FAULT. MAINTENANCE REPLACED EXTRACT FAN IAW AMM 21-28-54 AND PERFORMED SATISFACTORY OPERATIONAL CHECK.