As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED AIR CONDITIONING WAS NOT WORKING. INSPECTION FOUND FORWARD SUPPORT BEARING HAD FAILED. THIS FAILURE CAUSED THE DRIVE QUILL TO SHEAR. THIS IS THE THIRD BEARING FAILURE OF THIS NATURE. BOTH BEARINGS WERE REPLACED AT 1111 HRS. SUBMITTER SUSPECTS BEARINGS ARE INADEQUATELY LUBRICATED.