As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON DEPARTURE AT 600' AGL, NOTICED SMELL/AROMA OF ELECTRICAL OVERHEATING. NOTIFIED CREW AND IMMEDIATELY BEGAN A 270 DEGREE TURN TO RETURN TO DEPARTURE. DISCONNECTED BOTH GENERATORS, DISENGAGED BOTH BUS TIES, TURNED OFF AIR CONDITIONING UNIT. LANDED WITHOUT INCIDENT AND NOTIFIED ON-CALL MECHANIC. REPLACED AIR CONDITIONER BLOWER.