What was found
LANDING GEAR FAILED TO EXTEND UNDER NORMAL OPERATION. TOWER CONFIRMED ALL WHEELS UP & DOORS CLOSED. LANDING GEAR FAILED TO EXTEND UNDER NORMAL OPERATION. TOWER CONFIRMED ALL WHEELS UP & DOORS CLOSED. TROUBLESHOT MLG EXTENSION SYS IAW AMM 32-30-03 & WDM 32-60-00. FOUND MLG HYD SELECTOR & DUMP VALVE FAILED CHECK. R & R THE EXTENSION & HYD SELECTOR DUMP VALVE IAW CMP 323009. PERFORMED SATISFACTORY MLG CYCLING TEST IAW CMP 323906. PERFORMED SATISFACTORY MLG EMERGENCY EXTENSION OPS TEST IAW CMP 323901.