As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW SMELLED SMOKE IN THE CABIN FOLLOWED BY A CYCLING "GRUMBLING" NOISE WHILE AT CRUISE FLIGHT. MADE A PRECAUTIONARY LANDING WITHOUT INCIDENT. MX INSPECTED AND FOUND THAT THE AFT EVAPORATOR BLOWER MOTOR FOR THE AIR CONDITIONING SYSTEM TO BE THE CAUSE OF THE PROBLEM. ACFT RETURNED TO SERVICE.