As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU FAILED ON START UP. INSPECTED APU PER MEL PROCEDURES, FOUND APU DAMAGED. AIRCRAFT FERRIED TO MDT FOR REPAIRS. INSPECTED APU, FOUND UNCONTAINED CATASTROHIC FAILURE OF THE COMPRESSOR ROTOR. REMOVED AND REPLACED APU. PERFORMED STRUCTURAL REPAIR MANUAL AND REPAIR DRAWINGS. AIRCRAFT RETURNED TO SERVICE. (M)