As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PROBLEM STARTED WITH INSTALLATION OF NEW TCM HARNESS IGNITION SYSTEM. RESULTED IN REPEATED FAILURES IN MAGNETO ON ONE SIDE OR OTHER (I.E., LEFT AND RIGHT). MAGNETOS WERE REMOVED AND CHECKED. POINTS AND CAPACITORS REPLACED. ENGINE AND AIRFRAME ELECTRICS CHECKED OK. CAPACITOR BATCH NR 9920 FOUND DEFECTIVE. REPLACED WITH NR 9948. OK TO-DATE, 1-24-00. (X)