As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
REMOVED ROCKER COVER TO INSPECT FOR AD APPLICABILITY AND FOUND PARTICLES OF SPRING SEAT LAYING IN BOTTOM OF ROCKER COVER. DISASSEMBLED EXHAUST VALVE SPRING. FOUND SEAT BROKEN AROUND INNER RADIUS. SUBMITTER STATED EXHAUST VALVE GUIDE APPEARED TO BE .0625 INCH FARTHER OUT OF HEAD THAN REQUIRED. APPEARED AS IF VALVE GUIDE HAD WORKED LOOSE IN HEAD.