As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
A LOSS OF 500 RPM IN-FLIGHT PROMPTED A NORMAL LANDING AT AIRPORT. FURTHER INVESTIGATION REVEALED NR 2 CYLINDER INOPERATIVE. CLOSER DISASSEMBLY REVEALED THE COMPLETE ROCKER ARM ASSY WAS BROKEN LOOSE. ROCKER ARM BOSSES WERE ALL BROKEN OFF HALF WAY UP THEIR HEIGHT. AD 94-04-05 C/W 235.2 HRS PRIOR AT 6-1-94.