What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
Narrative: engine lost power and ran rough. Pilot landed in field 4 miles west of Carroll, MI airport. No injuries or damage. Aircraft inspected by mechanic who found 2 spark plugs on number 1 cylinder and 1 sparkplug on number 3 cylinder peened over and inserviceable. Cause of peening could not be determined. Engine TSO 550 hours. Airworthiness- cause of spark plug peening not determined. Appears to be isolated incident.
As the FAA filed it
NARRATIVE: ENGINE LOST POWER AND RAN ROUGH. PILOT LANDED IN FIELD 4 MILES WEST OF CARROLL, MI AIRPORT. NO INJURIES OR DAMAGE. AIRCRAFT INSPECTED BY MECHANIC WHO FOUND 2 SPARK PLUGS ON NUMBER 1 CYLINDER AND 1 SPARKPLUG ON NUMBER 3 CYLINDER PEENED OVER AND INSERVICEABLE. CAUSE OF PEENING COULD NOT BE DETERMINED. ENGINE TSO 550 HOURS. AIRWORTHINESS- CAUSE OF SPARK PLUG PEENING NOT DETERMINED. APPEARS TO BE ISOLATED INCIDENT.