Re: Fuse panel
Sounds like the fuse/switch panel I had a couple of boats ago. You had to insert a thin tool like a small screwdriver or paperclip into one edge of the square fuseholders to release the fuse cap.
With time what also happened was that on some of the fuseholder caps the plastic arm that sat in the release hole (was supposed) to hold the cap in would gradually bend and no longer keep the fuse tight enough to make good contact. One solution was to find another panel and cannibalize the caps. Better solution was to replace the entire panel with something of better quality.
1998 Jeanneau SO45.2