As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MILD ODOR IN COCKPIT AND CABIN 6 HOURS INTO FLT WHILE CRUISING AT FL330. ODOR SEEMED ELECTRICAL. DISSIPATED THEN RETURNED 15 MINS LATER WITH R RECIR FAN EICAS MESSAGE. UNLATCHED RIGHT RECIRC FAN SWITCH IAW MCC DIRECTION. NDS MFN 4100941B NIS ATL, REPLACED RT RECIRC FAN OPS CK OK NO SMELL PRESENT MCO AND PLACARD REMOVED. ETOPS CATEGORY 'E': PROBLEMS WITH SYSTEMS CRITICAL TO ETOPS.