I have Checkmate enabled and it runs surface scans on my conventional HDDs but omits them on my external SSD and the SSD part of the fusion drive. I can only guess that this is programmed into Checkmate by Micromat. I have not tried to run a surface scan manually with TTP.
Checkmate 1.1.5 and previous versions have always performed surface scans of the SSD portion of the fusion drive in my Mac mini. Unlike Checkmate's SMART and other tests, surface scans are only performed once a week and sometimes multiple partial scans of one drive may be logged so you have to scan the logs carefully to find the SSD scan.
