Just noticed that cranks were wobbly on my CDF. Quick fiddle identifies that the problem is the BB bearings. This has happened before, then it went very quickly from slight wobble to unrideable.
Good thing I spotted it, as I was about to set off for a longish ride, with no prospect of assistance to get home.
Not sure how I identify a compatible replacement.
Crankset is a GRX. Frame is old steel CDF.
I'm going to go and try to remove the BB.