As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENGINE COMPONENTS INC., PISTON RING FOR TSIO-520 SERIES WITH CHROME CYLINDERS. RING P/N 252501F-CC, THE PART NUMBER IS STAMPED ON BOTTOM OF RING INSTEAD OF TOP OF RING. IF INSTALLED AS MARKED, IT WILL NOT FIT IN THE PISTON RING LAND - TOP RING LAND POSITION.