As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT CRUISE FLIGHT, THE CREW SENSED A BURNING ODOR THAT WAS DETECTED IN THE AFT CABIN. AT THAT TIME THE AIRCRAFT WAS DIVERTING TO AIRPORT. THE PILOT TURNED OFF THE AIR CONDITIONING SYS, IN WHICH THE CREW SAID THE SMELL WAS GOING AWAY, BUT A FEW MOMENTS LATER THE ODOR HAD GOTTON WORSE AND SMOKE WAS BEGINNING TO FILL THE AFT PORTION OF THE CABIN AGAIN. AN UNEVENTFUL LANDING WAS MADE. FOUND THAT THE AFT EVAPORATOR MOTOR HAD FAILED.