Success! (at least so far). The kickstart 58 worked (on the drive/image where I tried the `mfsck -m4`), I have had two successful service connections - will keep an eye on it just to make sure it continues beyond a handful (which was the best I had previously had) and update if things cease to work. Thanks @jmbach for the pointers. I am curious however: is kickstart 58 equivalent to running `mfsck -m1` on the drive?