Most likely transistor driving the coil is bad.

Check if it's shorted with a meter. Youtube has lots of videos to use a meter or check a transistor for shorts.

LTG : )™

Yup it's probably the transistor .

That is not advised. A transistor can only sink so much current; surprising it by having it drive two coils will probably fry it. Plus, the game will get confused as to which drop targets are up when it goes to try and reset them.

Replacing the transistor is not hard for anyone who works on circuit boards. Coil test will tell you which one is bad, as will the manual. I looked since I had it handy, it's Q7. It's an easy replacement. I guess you might also have to replace the diode, so add another two cents. Should cost about $2 in parts.