Just picked up a Robocop pinball and everything works except both flippers.
Did you get the game knowing the flippers didn't work or you found out they didn't work when you got it home?
It looks like your problem is off the PCB. Also the manual does not have all the schematics. the only thing i could find was this.
CN19 says "Flipper ground from CPU Relay".
CN1 says "switched ground for flippers"
So I am not sure what this means as there is no CPU PCB and various other schematics.
Also there is a .1uf cap across the flipper switches.
Did you measure across each flipper switch to make sure they were open circuit?
Does anyone have the full manual with all the schematics? robocopFlipperschem.jpg