As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) WHILE IN CRUISE AT 2,000 FEET A LOUD REPORT WAS HEARD FROM THE ENGINE. FOLLOWED WAS EXTREME ENGINE VIBRATION. POWER WAS REDUCED TO IDLE. THE AIRCRAFT WAS LANDED. UPON INVESTIGATION IT WAS DETERMINED THAT NR 5 AND NR 1 CONNECTING RODS WERE BROKEN. ENGINE CHANGED.