As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING THROTTLE MOVEMENT FORWARD TO FULL POWER, ENGINE ABRUPTYLY BEGAN TO RUN EXTREMELY ROUGH. NO COMPRESSION ON ONE CYLINDER. FOUND NR 3 CYLINDER CONNECTING ROD BROKEN NEAR CRANKSHAFT JOURNAL AREA. ONE CONNECTING ROD BOLT INTACT, THE OTHER BROKEN. EXTENSIVE DAMAGE TO LOWER CRANKCASE ABOVE OIL SUMP FROM CONTACT WITH CONNECTING ROD.