As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FOUND HOLE IN ROCKER COVER CAUSED BY ROCKER ARM ON EXHAUST SIDE. FOUND FWD STUD ASSY BROKEN OFF FLUSH WITH CYLINDER HEAD. STUD (PN 401852). ROCKER RETAINER (PN 631996) WAS BROKEN AND HALF MISSING (GONE OUT OF HOLE IN COVER) IB STUD HOLD DOWN NUT WAS 4 TO 5 THREADS FROM COMING OFF. SUSPECT NUTS WERE NOT PROPERLY TORQUED.