What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
Crew received APU fault caution message. Mtc investigation found a blown-out seal on the APU exhaust duct, causing damage to adjacent APU wiring. Flight recorders were removed and quarantined for possible review. The APU was placed under MEL, new recorders installed, and the aircraft returned to service. Follow up mtc resulted in the APU being replaced and a service difficulty report being submitted for the blown seal.
As the FAA filed it
CREW RECEIVED APU FAULT CAUTION MESSAGE. MTC INVESTIGATION FOUND A BLOWN-OUT SEAL ON THE APU EXHAUST DUCT, CAUSING DAMAGE TO ADJACENT APU WIRING. FLIGHT RECORDERS WERE REMOVED AND QUARANTINED FOR POSSIBLE REVIEW. THE APU WAS PLACED UNDER MEL, NEW RECORDERS INSTALLED, AND THE AIRCRAFT RETURNED TO SERVICE. FOLLOW UP MTC RESULTED IN THE APU BEING REPLACED AND A SERVICE DIFFICULTY REPORT BEING SUBMITTED FOR THE BLOWN SEAL.