Hampton, VA
Quoted from Hazoff:Its that transistor on the board, thank you for this I'm going to order one for my StarTrek. Hopefully it works, I can see the brown burn marks on the one I have in there now. For $55 shipped worth a try.
When I got my ST25th back in 1999 it was missing the chaser light board and I could not find one. That was long before they made the repo. I took the schematic in the manual and made one on a Radio Shack project PC board. It's still in my game to this day. I am sure my original board was missing because I found shorts in my light strings so I am willing to bet if your board has burn marks you also have a short somewhere in your light string. I took mine apart and fixed the shorts and replaced a few of the bulbs which were blown out. It's tricky but doable. 
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