What was found
DURING AN ANNUAL INSPECTION, ONE ROCKER BOX COVER ON THE LEFT ENGINE WAS REMOVED IN THE PROCESS OF REPLACING PUSHROD TUBE SEALS. DISCOVERED ONE ROCKER SHAFT RETAINER CRACKED INTO TWO PIECES. DECIDED TO INSPECT REMAINDER OF CYLINDERS AND FOUND 19 OF 24 ROCKER SHAFT RETAINERS EITHER COMPLETELY CRACKED IN HALF OR ALMOST CRACKED IN HALF. ELECTED TO REPLACE ASS RETAINERS AT THIS TIME. THIS IS AN AREA THAT IS NOT NORMALLY ACCESSED DURING A NORMAL ANNUAL. SUSPECT THAT THE CAUSE MAY HAVE BEEN OVER-TORQUE ON THE NUTS HOLDING THE RETAINERS.