pull the board out of the machine, remove one fuse at a time and have a good look at the clips.  At least one will be cracked, try to move the clip tabs with your fingers.  These clips always break.

Just removed board out....Each fuse removed one at a time..Visual inspection of clip looked ok.  With flat blade screwdriver on inside of clip pressed away and has good tension...unlike the powerboard ones which went soft and bent with same method...

Board looks as if had previous repair (apart from the Q1 which I replaced) so I suspect they may have been done before...