As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LOW COMPRESSION NR 5 CYLINDER - BURNED VALVE. FOUND BOTH LIFTERS FOR INTAKE AND EXHAUST SPALLED. LOOKED AT OTHER LIFTERS IN ENGINE WITH A BORESCOPE AND FOUND SEVERAL OTHER LIFTERS IN ENGINE WITH SAME SPALLING DEFECT. PN ON LIFTERS IS 653888 AND 653877. THESE PN LIFTERS ARE DESIGNATED AS NOT AFFECTED BY MSB 09-8 OR AD 2009-24-52.