As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE AIR CONDITIONER BELT GUARD FAILED IN FLIGHT. INSP REVEALED 2 SMALL CRACKS AT THE LT SIDE WELDED NUT. THIS FAILURE CAUSED A 2 INCH X 2 INCH STEEL PIECE OF THE BELT GUARD TO SEPARATE, STRIKE THE AIR CONDITIONER CLUTCH ASSY AND SHEAR THE CLUTCH ASSY, BOTH OF WHICH SUBSEQUENTLY DEPARTED THE ACFT.