From FreeSpace Wiki
sabotage-subsystem Sabotage subystem (Action operator) Reduces the specified subsystem integrity by the specified percentage.If the percntage strength of the subsystem (after completion) is less than 0%,subsystem strength is set to 0%. Takes 3 arguments... 1: Name of ship subsystem is on. 2: Name of subsystem to sabotage. 3: Percentage to reduce subsystem integrity by.