As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RECEIVING INSPECTION OF A NEWLY OVERHAULED ENGINE FOUND PUSH ROD HOUSING COULD BE POPPED OUT OF SEAT. REMOVED ROCKER COVER AND FOUND HOLD-DOWN SPRING BROKEN. FURTHER INVESTIGATION FOUND 3 OF 4 PUSH ROD SPRINGS BROKEN. SUBMITTER SUSPECTS SPRINGS MISMANUFACTURED AND ARE BRITTLE.