As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING RUN-UP AFTER ANNUAL INSPECTION LT MAGNETO GROUNDED OUT. INSPECTION FOUND "P" LEAD INTERMITTENT. ON FLEXING RT "P" LEAD IT WAS ALSO FOUND TO BE INTERMITTENT. FURTHER EXAMINATION DISCLOSED DETERIORATED INSULATION CLOSE TO ENTRY TO MAGNETOS ALLOWING GROUNDING ON BRAIDED SHIELDING.