Ok Peter.

Was a useful check to do even it it found no issues on this occasion.
Bob is going to have to root around in your system to see what is going on
I canít think of any other Windows tools to try that would find and fix this issue in a simple way.

All this trouble as a result of a computer manufacturer following the fad of building systems with a ridiculously small SSD C drive just to maximise profit, I just hope this isnít going to be an ongoing issue for you once Bob manages to track and fix this particular problem.

If it were me, after this bug is fixed I would replace that small SSD C drive with a bigger one and migrate the OS and recovery partitions over. I admire your perseverance, I would have given up by now and started afresh!