Quoted from PinballZach:
I just restored a JP and all is working good except this one problem. When I shoot the Power Shed to re-light the Control Room it doesn't stay lit, it only flashes shortly from hitting the in-lane switch. I looked at the Power Shed switch in the subway and it looks fine, and the strange thing is that when I hit the Power Shed in CHAOS mode it registers the "S". It just won't re-light the Control Room or work during System Boot mode.
[pure guess] It could be a matrix issue that has different effects depending on current game mode?
If you go into switch test mode...does anything else appear stuck? Does the control room switch work normally or does it possibly trigger multiple switches instead of itself in test mode?