After surface equipment prepared and ready to rigging up lubricator. MAST man observed green hook winch can lift lubricator just only 1 m. and couldn't lifting up. so try to lay down green hook winch can move down. tried to lifting again green hook winch can lift lubricator just only 1 m. and couldn't lifting up. after tried to many time decided to swap yellow winch the problem still remained.
Client decided rig down LWM and swap to using MAST (DOP-F). Operator tried to unlatch 3rd stage but couldn't unlatch tried to unlatch by apply hydraulic latching many time but the problem still remaining. after pull gay wire to shack MAST's stage at last can to unlatch and rigged down successfully.