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Thursday 24 May 2018 at 11:19
Upon closer inspection it turned out that the second ball in the trough sometimes straddled the last two switches. Polished the switch wires, ball guide and bent the switch leaf closest to the outhole a little to make it less sensitive. Problem solved.
Source: http://pinside.com/pinball/forum/topic/star-wars-data-east-random-outholes#post-4415503