As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) PILOT REPORTED A RT MAGNETO ROUGH CONDITION DURING PRE-FLIGHT GROUND RUN UP CHECKS, PILOT DESCRIBED AN APPROXIMATELY 700 RPM DROP WHEN RT MAGNETO WAS SELECTED. THE RT MAGNETO WAS REMOVED AND INSPECTED AND THE FAULT WAS FOUND TO BE WITH THE POINTS NOT OPENING ON 1 SIDE WHEN MAGNETO WAS ROTATED. DURING INSPECTION OF THE POINT KIT IT WAS FOUND THAT THE PLASTIC RUB BLOCK WAS EXCESSIVELY WORN OUT NOT ALLOWING THE POINTS TO OPEN.