As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIR CONDITIONER BELT HAD BEEN REPLACE. AC RELEASED FOR FLIGHT. AT ABOUT THE SAME TIME WE WERE TONED FOR A SCENE CALL. ABOUT 30 SECONDS AFTER TAKEOFF, SMELLED SMOKE, AIR CONDITIONER WAS TURNED OFF BUT THE SMELL OF SMOKE GOT WORSE SO A 180 TURN WAS MADE AND RETURNED TO THE AIRPORT. WHEN THE MECHANIC INSPECTED THE AIR CONDITIONER UNIT, THE COMPRESSOR HAD SEIZED. AIRCRAFT WAS GROUNDED AND PARTS REPLACED.