As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DOWNLOCK SUPPORT LOWER PIN FOUND BROKEN OFF CAUSING POWERPACK MOTOR TO NOT SHUT OFF. BATTERY DRAINED VERY LOW. ELECTRICAL SYSTEMS OPERATED VERY MARGINAL DURING IFR FLIGHT. FOUND LEFT DOWNLOCK SUPPORT LOWER PIN CRACKED. THIS CRACK NOT VISIBLE WITH DOWNLOCK ASSEMBLED. SUSPECT CAUSE, AIRCRAFT OPERATED ON ROUGH LANDING STRIP. SUBMITTER RECOMMENDS DISASSEMBLY OF LOCK TO ZYGLOW PINS IF ACFT IS OPERATED ON ROUGH LANDING STRIPS.