One of our boxes suddenly threw the 197 & 198 errors, with 100 in each, about a year, maybe two, back. I didn't run any diagnostics as I'm not that au fait with the tools, but the box has been working fine since and so far the numbers haven't gone up.
So it's probably not worth worrying about unless they keep trending up or something else starts complaining.
(Edit. It may be a bit of deja vu but I have an odd feeling that ours started out with 98 which would mean it's gone up 2 but without raising an alert. However my memory is atrocious, so I'm probably wrong.)