As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MKE INFLIGHT T164/18JUL LAX TO EWR - THREE HOURS INTO FLIGHT CREW HEARD LOUD BANG ACCOMPANIED BY VIBRATIONS AND STRONG ELECTRIC SMOKE ODOR. FLIGHT ATTENDANTS REPORTED HAZE IN THE AFT CABIN. SMOKE DISSAPATED BEFORE LANDING. LANDED MKE WITHOUT INCIDENT. REPLACED RIGHT RECIRCULATION FAN. SYSTEM GROUND CHECKED NORMAL OPERATION.