Popped off the offending keys, clean as a whistle behind and under. Hmm. Well, maybe just removal and reinstallation helped.
This YouTuber is really, really, really into keyboards and he seems to like the older mechanical ones. Pretty cool.
https://www.youtube.com/user/Chyrosran22
pckeyboard.com is Unicomp who made the IBM Model M and still make it today. The Youtuber guy reviewed it. I’m thinking about that - $100, brand new, no eBay fuss, and it is a genuine made in USA product from a small company in Kentucky. I don’t need any bells and whistles. Just a really nice keyboard. And time away from it.