Got a Night Rider up and running. Noticed during a game that when any slingshot switch was closed both right and left fire. Put it into solenoid test and both solenoids fire when testing the right and the left slingshot coils. Only had about five minutes to look at last night. Will look into more tonight.

Anyone had this issue before or have a good place to start looking?

I checked the grounded the tab (collector) of both transistors that operate the slings. Q11 and Q16 I think it was off the top of my head. Both slings operated separately...correctly... when grounding the tab. So I figured they must be shorted together further upstream.

I looked at the schematic, and at U2, pins 15 and 16 feed Q11 and Q16. Perfect place for a short due to the close proximity of the pins. I pulled the board and looked at the back side. Sure enough there were damaged pads in the area, and a blob of solder covering both pins 15 and 16. Once it was removed the slings worked perfect.

Thanks for the help Andrew barakandl