As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ROCKER COVERS REMOVED DURING 100 HOUR INSPECTION TO INSPECT INTAKE AND EXHAUST ROCKERS FOR CORRECT INSTALLATION. FOUND NR1 AND NR6 CYLINDERS HAD INTAKE ROCKER (P/N 639614) INSTALLED IN THE EXHAUST VALVE POSITION. PARTS MANUAL CALLS FOR P/N 639615 ROCKER TO BE INSTALLED IN EXHAUST VALVE POSITION. THIS IS THE SECOND ENGINE DISCOVERED WITH THE SAME ABNORMALITY AFTER RECENT OVERHAULS FROM SAME OVERHAUL FACILITY.