If you refer to your manual there is a flasher/solenoid table, you are having a problem with #22 Whirlpool popper flasher. The drive transistor for that is Q30 on your WPC power driver board. It is the biggest board on the bottom right when you remove your backglass and I've also highlighted Q30 too.

If you have a DMM you can put it into diode setting and look at the TIP102 image I have attached. To test if a transistor is blown/shorted you put the black lead from your DMM to the main casing tab and then put the red lead to either outside leg and your meter should give you back a reading between 0.4-0.6 if it is good. If you get anything outside of this range like 0 or > 1.0 than your TIP102 is bad.

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For now you can just remove the bulb or disconnect it and continue playing your game safely till you get it repaired. You don't want a flasher bulb to stay locked on because it can damage or melt things like plastics.