switch panel

Hi there New owner of a 1994 Oceanis 400, learning fast and tidying up a few things. Some of the DC panel switches need more than one firm flick to make proper contact, and one or two don't work at all. Previous owners came up with various workarounds but I'd really like to get new switches in...

I have a 1991 Hunter 35.5 and I am looking to run wires from the battery storage area to the switch pannel/steareo. I can't figure out how they are currently ran even after looking at the wiring diagram. Any help on how to access wires in order to run some more would be much appreciated.