As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) MAGNETO WAS BEING TEST RUN WITH THIS NEW CAPACITOR DURING O/H. THE MAGNETO WOULD RUN INTERMITTENTLY AT ALL SPEEDS. THE CAPACITOR WAS REMOVED, TESTED AND FAILED THE SERIES RESISTANCE AND CAPACITANCE TESTS. ANOTHER NEW CAPACITOR WAS INSTALLED AND THE MAGNETO WAS TEST RUN AND RETURNED TO SERVICE.