I have a funhouse so have a rudy which is the same as the heads in your game
These heads are notorious for faults, but all the relevant parts are available, these heads are fixable.
Before you dismantle the head, take lots of photos of everything. This head is one of the trickier things in pinball to dismantle and rebuild, but has simple building blocks and just requires patience. Write down the order you dismantle things, as there is an order to putting this thing back together. If at all possible, do not remove the eyeballs or dismantle the left right eyeball link pin (looks like a big metal staple) as this is a pig of a job to reverse.
Your problem could be .....
Dead tranny, so do a volt meter check on the relevant coil when in head test to see whether it is getting the volts
Dead coil, per above
Continuity from the board to the solenoid (unlikely)
Broken plastic links (all available new)
Gunked up solenoid sleeves, these solenoids are very weak so may not move if dirty. Use ipa, solvol autosol to clean them thoroughly
And the worst of all, incorrect plunger alignment. These plungers only move a few mm, there is very little magnetic force to move them as the coils are so weak. You may need to adjust the coil brackets so everything moves smoothly with minimum friction
The worst thing about the plunger alignment is that over time they move. I hadn't played my funhouse for about two months.
@strobey and
@Dunc were coming over for a few games. So i tested them all out beforehand. Rudy's eyes failed to open. So i had to realign one of the plungers. Nasty little job, but fixed now and the game withstood two days at nlp without issue