Got the latest SSD Toolbox installed and it now shows the drive health as WARNING and highligths the "end-to-end errors" value in red, suggesting I contact Intel support. Hm... it may be time to panic
Well, I made another (incremental) backup of my SSD drive and then tried to take an image of it to another (SATA) drive using Acronis. It did not go very well at all. It reported sector read errors and aborted. I think Acronis reads the drive by sector while my backup has read only changed files. Anyway, now the SSD reports over 200 "end to end errors" and I am yanking it out, replacng with the ol' good SATA which I am restoring the backup to.
This is the second time I am going to use Intel's warranty on the SSD drive in this laptop: the first time the drive erased itself (the "8MB capacity" problem). Now the read errors... Oh boy