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Gottlieb Volcano and Black Hole switch problem


Inserted Coin

I ran the switch test #18 on both of these machines of mine and each came up with a number other than the normal "99." I checked their manuals and noticed that the switch numbers pointed out during the tests were the switches in the ball drain area right in front of the player. There are two in that area on Volcano and one on Black Hole. I then took the aprons off both games and did the switch test again: this time removing a ball so the switches are not depressed. During this go round the "99" comes up like it's supposed to. It should be the other way around. Any idea why I'm getting "99" only when the switches aren't depressed when I'm supposed to get that number when they are?