What was found
ON APPROACH TO AIRFIELD, THE LANDING GEAR DEPLOYED WITHOUT INPUT FROM THE PILOTS. SHORTLY AFTER, THE PUMP RELAY CIRCUIT BREAKER POPPED. PILOTS USED MANUAL PUMP TO EXTEND THE GEAR TO A LOCKED POSITION AND LANDED. FURTHER INVESTIGATION REVEALED THAT THE "MANIFOLD" HOLDING THE GEAR "IN" AND GEAR "OUT" LINES INTO THE HSG HAD RELEASED AFTER THE BOLT SECURING THE MANIFOLD HAD PULLED OUT OF THE HSG. INVESTIGATION IS CONTINUING.