What was found
PILOT REPORTED BOTH FLOW LIGHTS CAME ON AND STAYED ON AFTER TAKEOFF. IMMEDIATELY, GEAR WAS LOWERED, MAINS LOCKED AND NOSE GEAR UNSAFE. BLEW GEAR BOTTLE, NOSE GEAR LOCKED DOWN. FOUND RT LINE FROM PUMP TO FIREWALL BLOWN, PN AE1003957G0310. REPLACED LINE WITH NEW LINE. OPERATED GEAR MORE THAN TEN TIMES FOR BLEEDING, ALL NORMAL.