As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) PILOT REPORTED EXCESSIVE LT MAG DROP DURING RUN-UP PROCEDURE, 200RPM. CONFIRMED MAG DROP. INVESTIGATION REVEALED LT MAG ONLY OPERATING INTERMITTENTLY. REMOVED MAG FOR RETURN TO O/H FACILITY FOR INSPECTION AND INSTALLED SERVICABLE O/H MAG. LT MAG TIME SINCE O/H= 115.4 HRS.