As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE PUSH ROD HOUSING TUBE RETAINING SPRINGS WERE BROKEN AT THE BEND JUST OB OF THE MOUNT HOLE. THE UNBROKEN SPRINGS HAD A TOOL LINE AT THE POINT OF THE BEND. THERE WERE 2 BROKEN SPRINGS, LOCATED ON NR 3 AND NR 4 CYLINDERS. ONE SPRING HAD ONE SIDE BROKEN OFF THE OTHER BOTH SIDES WERE BROKEN. BELIEVE THE TOOL MARKS ARE CAUSING THE PROBLEM. ALL 6 SPRINGS WERE REPLACED WITH NEW MFG PARTS AND SOME ALSO CONTAINED THE TOOL MARKS AT THE BEND. (K)