You may have already done this, but if you google (no quotes):
AUS urinary retention after
that pulls up a number of articles about
this problem, which seem to describe what Randy is experiencing.
I looked at a few of the articles, and thought the following seemed to have helpful information:
https://urology.stanford.edu/content/dam/sm/urology/jjimages/publications/a-systematic-approach-to-the-evaluation-and-management-of-the-failed-artificial-urinary-sphincter.pdf(Technically, this article was written with female patients in mind, but its discussion of AUS problems (see p.3) looks like it applies to all AUS applications)
and this one is pretty technical, but gives some interesting stats involved with AUS failures:
https://www.gavinpublishers.com/articles/research-article/journal-of-urology-and-renal-diseases-issn-2575-7903/early-complications-after-artificial-urinary-sphincter-insertion Other articles called up talk about
infection being a primary cause of AUS-related urinary retention, and also something called "erosion," and other articles which the above search calls up may also be helpful.