I found a video where Eric Bazilian broke down Johnny B and in it he gave us a hint! (Screen shots below)
Since Andy and Eric shared bass duties on the album, chances are they used the same gear.
Eric played a Precision on Johnny B and Andy is known to have played them too, and the Ampeg B15N is pretty much a studio standard.
According to Eric, the same setup was used on All you zombies two years previous.
I think my question has been answered.
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