As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INFLIGHT RETURN TO BASE LEG PILOT REPORTED A BURNING SMELL IN CABIN, TURNED OFF A/C SYSTEM AND SMELL WENT AWAY. LANDED AIRCRAFT AT 94E AIRPORT. WHEN MECHANIC WAS INSPECTING THE AIRCRAFT FOUND THAT AIR COMM AFT EVAPORATOR BLOWER MOTOR HAD FAILED AND WAS THE CAUSE OF THE BURNING SMELL REPORTED.