Thanks @jkrosado this helped! However I had to run a slightly different command to kill the running process:
First find the ID of the running process with:
ps aux | grep fsck
--> root 1234 3,0 11,0 32432423 234234 ....... /...fsck_hfs
and then note the first ID (1234) and use this to kill the process with
sudo kill -9 1234
YvesZ
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