As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AT ROUTINE INSPECTION, THE MAGNETO TO ENGINE TIMING WAS FOUND TO BE CONSIDERABLY OFF (ABOUT 5 DEG OFF). THE MAGNETO WAS REMOVED AND FOUND THAT THE E-GAP AND POINT OPENING WERE WAY OFF. THE POINTS ONLY HAD 100 HOURS ON THEM AND THE PLASTIC/NYLON FOOT WAS WEARING SO THAT THE POINT GAP WAS GETTING SMALLER AND SMALLER. ( HAD A C172 DO A PRECAUTIONARY LANDING IN MAY 03 DUE TO ENGINE PROBLEM WHICH TURNED OUT TO BE MAGNETO POINTS NOT OPENING AT ALL.)