As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: CABIN AND COCKPIT ODOR AT FL310. RECIRC FAN SUPPLY CB POPPED. ACCOMPLISHED SMOKE/ODOR FUMES TROUBLESHOOTING CARD 26L00021001. ISOLATED ODOR TO LEFT CABIN RECIRCULATION FAN AND REPLACED IT PER AMM 21-21-51. A SATISFACTORTY OPERATATIONAL CHECK WAS ACCOMPLISHED.