As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED AIR CONDITIONER SYS WAS NOT PUTTING OUT COLD AIR. UPON INVESTINGATING THE PROBLEM IT WAS DISCOVERED THAT THE AIR COMPRESSOR WAS SEIZED AND THE DRIVE BELT BURNED THOUGH. 2 NEW FREOM COMPRESSORS WERE INSTALLED AND BOTH SEIZED CASUING THE BELT TO BURN THROUGH ON THE DRIVE PULLEY DURING GROUND OPS CHECKS.