As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED. DURING CRUISE, A BURNING ELECTRICAL ODOR WAS REPORTED IN THE LT 2 AND RT 2 DOOR AREAS AND IN FIRST CLASS AND A RECIRCULATION FAN STATUS MESSAGE DISPLAYED. THE SMOKE, FIRE OR FUMES CHECKLIST WAS ACCOMPLISHED AND THE ODOR DISSIPATED. TROUBLESHOOTING RETURNED CODE 21-2440, FORWARD UPPER RECIRCULATION FAN MOTOR INOPERATIVE. R & R FORWARD UPPER RECIRCULATION FAN IAW AMM 21-25-01. OPS CHECK GOOD.