What was found
AIRCRAFT REPORTED NO DOWNLOCK INDICATION ON LT GEAR AFTER REPEATED CYCLES. AIRCRAFT MADE LOW PASS. LT GEAR WAS CONFIRMED TO BE UP AND LOCKED. MANUAL UPLOCK RELEASE DEPLOYED. LT GEAR STILL LOCKED UP. EMERGENCY BLOW-DOWN BOTTLE WAS ACTUATED AND 3 GREEN INDICATED. ACFT LANDED UNEVENTFULLY. ACFT PLACED ON JACKS, FAILURE DUPLICATED. FOUND UPLOCK LEAKING INTERNALLY AND BYPASSING FLUID. ACTUATOR ALSO ACTS AS SEQUENCE VALVE TO MAIN ACTUATOR. NEW PART INSTALLED, PROBLEM CORRECTED.