That was the original reason for my post, to reduce my own speculation by learning from other people's experience navigating the system. This is a unique process and I am trying to understand better how the review process works. The strange position I found myself in was staring at a blank sheet of paper not knowing what to speculate about (so I could write something to the Ombudsman). I wrote a letter anyway.

According to an article, between 2002 and 2009, 6,534 NEXUS memberships were revoked, and another article says that Sentri revokes about 2,000 cards per year. GOES is in the same family with these programs, and I figure has a similar rate. So I'm probably asking a common question on behalf of a lot of people. Maybe they can update the GOES FAQ to provide some guidance on what information the Ombudsman is looking for when the applicant has no clue of the specific reason they are not eligible anymore.