...I am back to: 'unusual force needed to shift, when the engine is cold or cool, occasionally triggering a YCCS fault at start-up, ...
If the YCC-S detects any fault, e.g. "unusual force needed" or "clutch movement not what was expected", it
will put up an SH__nn code as well as turn on the orange fault light, which is why I asked if there was an error code in my earlier post.
Maybe it's worth looking through the diagnostic history in case there was one, but you didn't see it?
If there is none, it sounds like a (non-YCCS specific) electrical fault to make the engine run rough and flicker the fault light.