What was found
AFTER GEAR RETRACTION AND GEAR HANDLE PLACED IN NEUTRAL, NOSE GEAR WILL NOT STAY UP. AIRCRAFT RETURNED TO PANC. MAINTENANCE FOUND RETRACT MECHANISM (DRAG LINK), UPPER LEFT HAND LINK BROKEN. REPLACED UPPER RETRACT MECHANISM, PERFORMED GEAR RETRACTION TEST PER DOUGLAS MM AND RETURNED AIRCRAFT TO SERVICE. (M)