As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
REMOVED LEFT MAGNETO FOR 500 HOUR INSPECTION AND FOUND DISTRIBUTOR BLOCK ASSEMBLY BURNED THROUGH AND PIECES FLOATING AROUND INSIDE MAGNETO. LARGE AMOUNT OF DUST COATED SURFACES AND BURNING EVIDENT ON COIL AND ROTOR HOUSING. CARBON BRUSH AND CAM ARE EXTREMELY WORN. ACCORDING TO THE ENGINE LOG THE MAGNETOS WERE R&R AT TACH TIME 1007.7 FOR 500HR INSPECTION ON 04/17/2009. DURING PRE-INSPECTION RUN-UP MAG DROP WAS NO MORE THAN 75-80RPM AT 1800RPM MIXTURE FULL RICH.