As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
4 MINUTES AFTER TAKEOFF ALL CREW MENBERS NOTICED A VERY STRONG SMWLL OF HOT ELECTRICAL FUMES THROUGHOUT THE CABIN. NO VISIBLE SMOLE WAS SEEN. CREW RETURNED TO BASE AND ABORTED THE FLIGHT. MAINTENANCE FOUND THE AFT AIRCONDITIONER EVAPORATOR BLOWER MOTOR TO BE INOP. REPLACED THE BLOWER MOTOR WITH A NEW UNIT AND THE SYSTEM WORKED NORMALLY. MOTOR P/N ES61142-1 FOR THE AIR COMM AIRCONDITIONING SYSTEM