As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PRESSURIZED MAGNETO AIR SOURCE FILTER MELTED/DEFORMED. IF CONTINUED COULD CAUSE BLOCKAGE OF AIR TO MAGNETO CAUSING PREMATURE MAGNETO FAILURE. PROBLEM SEEMS TO COINCIDE WITH RELOCATION OF FILTER CLOSER TO CYLINDERS WITH NEWER MANUFACTURED AIRCRAFT