As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENG QUIT IN FLT. RETURNED TO 5B5. FOUND ON BOTH MAGNETOS ALMOST 100 PERCENT OF THE TEETH ON DISTRIBUTOR GEARS WERE MISSING (SHEARED OFF), BOTH DISTRIBUTOR GEAR CONTACT FINGERS BROKEN OFF AND WEDGED BETWEEN GEAR AND DIST. BLOCK CAUSING TOTAL LOSS OF IGNITION.