http://pinwiki.com/wiki/index.php?title=Sega/Stern_White_Star_Repair#General_illumination_problems

4.7 General illumination problems
The four general illumination (GI) strings are turned on and off via the relay on the power driver board. This is more or less the same setup like in earlier Data East and Williams System 11 games where the relay can be found on the power board. On the White Star board the relay is controlled via transistor Q200 and latch U206. They both seldom fail.

If one or more GI strings are out check fuses F24 to F27 and then connector J15. Although WhiteStar GI connectors don't burn and tarnish like early Bally/Williams WPC GI connectors, checking both the male and female connectors at J15 is worthwhile.

A leaky capacitor at C32

If the GI goes out during game play and turns back on when opening the door, check capacitor C32 on the power driver board. It normally has nothing to do with either the GI circuit or the relay voltage but a leaking cap can short the trace coming from Q200 to ground. In this case the relay pulls in and disconnects the GI. When you open the door the game cuts the coil power for the relay coil and the GI turns back on. This has been observed in a Twister game.

The fuse clips for the G.I. circuits also go bad by either cracking or just plain fatigue. This causes poor, erratic, or no contact with the fuse thus killing power to the lights.

Yay!