What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
Narrative: pilot and passenger departed half moon bay, CA on a pleasure flight destined to grass valley, CA. When in the vicinity of the Sacramento area the pilot reported that without any warning or indication the engine began running rough. He requested clearance to land at Sacramento (smf). Landing was uneventful. Preliminary inspection revealed the number 1 cyl had no compression. Pilot/owner hired a mechanic to do thorough analysis. While at the aircraft with the mechanic we detected that the number 1 cylinder was cracked nearly half was around the circumference of the cyl barrel. There was no other abnormalities noted. According to the owner, the engine was overhauled about 360 hours ago. Also discussion with the owner revealed he has noted higher than normal engine temperatures although not exceeding any limits. This can be attributed to the very high ambient temperatures while operating the aircraft.
As the FAA filed it
NARRATIVE: PILOT AND PASSENGER DEPARTED HALF MOON BAY, CA ON A PLEASURE FLIGHT DESTINED TO GRASS VALLEY, CA. WHEN IN THE VICINITY OF THE SACRAMENTO AREA THE PILOT REPORTED THAT WITHOUT ANY WARNING OR INDICATION THE ENGINE BEGAN RUNNING ROUGH. HE REQUESTED CLEARANCE TO LAND AT SACRAMENTO (SMF). LANDING WAS UNEVENTFUL. PRELIMINARY INSPECTION REVEALED THE NUMBER 1 CYL HAD NO COMPRESSION. PILOT/OWNER HIRED A MECHANIC TO DO THOROUGH ANALYSIS. WHILE AT THE AIRCRAFT WITH THE MECHANIC WE DETECTED THAT THE NUMBER 1 CYLINDER WAS CRACKED NEARLY HALF WAS AROUND THE CIRCUMFERENCE OF THE CYL BARREL. THERE WAS NO OTHER ABNORMALITIES NOTED. ACCORDING TO THE OWNER, THE ENGINE WAS OVERHAULED ABOUT 360 HOURS AGO. ALSO DISCUSSION WITH THE OWNER REVEALED HE HAS NOTED HIGHER THAN NORMAL ENGINE TEMPERATURES ALTHOUGH NOT EXCEEDING ANY LIMITS. THIS CAN BE ATTRIBUTED TO THE VERY HIGH AMBIENT TEMPERATURES WHILE OPERATING THE AIRCRAFT.