As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) THE PILOT DEPARTED AIRPORT: AT 2100 FT AND 4 MILES SOUTH OF DEPARTED AIRPORT, ENGINE STARTED TO RUN ROUGH, PARTIAL POWER LOSS. THE PILOT LANDED AT SAME AIRPORT WITHOUT ANY DIFFICULTY. UPON INVESTIGATION OF ENGINE, FOUND THAT THE CONNECTING ROD BOLTS P/N SL78027 FAILED AND SEPARATION OF CONNECTING ROD CUP. ENGINE SENT FOR FURTHER INVESTIGATION.