Please do look at the Sub Forums that you will find here. These are sections that Mini Lab Help.com has had running for a long time, but do not generate a lot of traffic and contributions.
But please do explore as you will find some really nice nuggets to take home
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Maybe the J484A position is only used when it actually detects the presence of a scratch, in which case it would probably create a bad scan.
As Minilab service has said, just remove all the Digital Masking boards and forget about them. Also forget about the errors in the self check, as long as the scans and prints have no issue it's not worth the expense to sort it out. All these circuit boards are very expensive.