In Engineering Control next to the Fluidics Control Computer.
Somebody's been tampering with the XERXES unit. In the interest of keeping secrets from the powers that be, I've installed a back door to the fluidics control computer. To activate it, install hardware override 45m/dEx in the systems monitoring unit in command control. You can find 45m/dEx in auxiliary storage 5 in the coolant tubes, keycode: 34760.