What was found
LEFT HYDRAULIC SYSTEM INDICATING A FLUID LEAK DURING FLIGHT. FOUND DUMP VALVE STILL OPEN FROM PREVIOUS EMERGENCY EXTENSION, FOUND HYDRAULIC LEAK COMING FROM RT NOSE VENT FOR EMERGENCY PNEUMATIC EXTENSION LINES. CLOSED DUMP VALVE & SEATED SHUTTLE VALVES IAW AMM 32-29-00. REMOVED LANDING GEAR SELECTOR, DUMP VALVE, INSTALLED OVERHAULED LG SELECTOR, DUMP VALVE IAW ACTUATION SYSTEMS FAA FORM 8130-3, REF AMM 32-30-03. JACKED AIRCRAFT IAW AMM 07-10-00. C/W SATIS LANDING GEAR CYCLING, OPS TEST.IAW AMM 32-00-00. C/W SATIS LANDING GEAR EMERGENCY EXTENSION SYSTEM FUNCTIONAL CHK IAW AMM 32-39-00. NO LEAKS NOTED. DOWN JACKED AIRCRAFT IAW AMM 07-10-00.