What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
(-23)Acft had taken off from petaluma, was in cruise configuration and noticed deteriorating power and manifold pressure. Reported rough running engine, prior to landing safely at oak. Turbo-charger failed, and the number 1 cylinder exhibited classic indications of extreme, detonation, causing engien failure. Further engine teardown inspection are scheduled for further determination of cause. Partial engine teardown and investigation has been on-going, in addition to reviewing fuel contamination possibilities, operator error possibilities, individual component adjustments, settings, and function, etc. Incident report will be amended as necessary to indicate further findings.
As the FAA filed it
(-23)ACFT HAD TAKEN OFF FROM PETALUMA, WAS IN CRUISE CONFIGURATION AND NOTICED DETERIORATING POWER AND MANIFOLD PRESSURE. REPORTED ROUGH RUNNING ENGINE, PRIOR TO LANDING SAFELY AT OAK. TURBO-CHARGER FAILED, AND THE NUMBER 1 CYLINDER EXHIBITED CLASSIC INDICATIONS OF EXTREME, DETONATION, CAUSING ENGIEN FAILURE. FURTHER ENGINE TEARDOWN INSPECTION ARE SCHEDULED FOR FURTHER DETERMINATION OF CAUSE. PARTIAL ENGINE TEARDOWN AND INVESTIGATION HAS BEEN ON-GOING, IN ADDITION TO REVIEWING FUEL CONTAMINATION POSSIBILITIES, OPERATOR ERROR POSSIBILITIES, INDIVIDUAL COMPONENT ADJUSTMENTS, SETTINGS, AND FUNCTION, ETC. INCIDENT REPORT WILL BE AMENDED AS NECESSARY TO INDICATE FURTHER FINDINGS.