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Sunday 20 May 2018 at 04:18
That's a classic and very typical problem with the horseshoe targets used in this and many other games made around that time,. The contacts more than likely have to be cleaned and adjusted. You have to disassemble them from the underside of the playfield.
Source: http://pinside.com/pinball/forum/topic/scorpion-fan-club/page/2#post-4407569