As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HAVE EXPERIENCED MULTIPLE FAILURES/DEFECTS OF THE A/C SYSTEM. THE TYPES OF FAILURES ARE PRIMARILY COMPRESSOR SHAFT OIL LEAKS AND COMPRESSOR LOCKUP FAILURE. THIS IN TURN CAUSES THE DRIVE BELT TO SHEAR AND WE HAVE AN INOPERATIVE A/C SYS. SOME OF THESE FAILURES OCCUR IN FLIGHT AND SOME ON THE GROUND PRIOR TO TAKEOFF.