As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE, THE FLT ATTENDANT REPORTED AN ODOR OF UNDETERMINED TYPE. AFTER CHECKING LIGHTS, FOUND THAT ISLOATING THE LOWER RECIRCULATION FANS, TURNED OFF AND THE THE ODOR DISIPATED. NO FAULTS NOTED ON EICAS. REPLACED IAW AMM 21-25-07-000/400-801.