What was found
WHILE IN-FLIGHT, GEAR HANDLE WAS LOWERED. HYDRAULIC PUMP ACTUATED, THEN STOPPED. TOTAL ELECTRICAL FAILURE WAS OBSERVED. GEAR WAS EXTENDED MANUALLY. LANDING ACCOMPLISHED. EXAMINATION OF THE MASTER SWITCH SOLENOID REVEALED AN OPEN ELECTROMAGNET COIL WIRE. THE CAUSE WAS UNDETERMINED. MELTED, BROKEN, CORRODED. FAILURE OF THIS ONE PART RESULTED IN THE COMPLETE ISOLATION OF THE BATTERY AND THE ALTERNATOR FROM THE ELECTRICAL SYSTEM. (X)