As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE CLIMBING UP TO CRUISE ALTITUDE, A BURNING RUBBER ODOR BECAME EVIDENT, A PRECAUTIONARY LANDING WAS MADE AND DISCOVERED THAT THE AIR CONDITIONER COMPRESSOR DRIVE BELT WAS BURNED AND MELTED. SYSTEM WAS TROUBLESHOT AND FOUND THE THAT THE AIR CONDITIONING COMPRESSOR WAS DEFECTIVE THAT CAUSE THE BELT TO GET HOT ON THE PULLEY CAUSING THE ODOR.