I have all the manuals for my 2003 274 that came with it, and after seeing your post, I browsed through the main owners manual. It's mostly very high level stuff you already know, mooring, setting an anchor etc.. There are a couple of wiring diagrams, but the wiring is pretty simple anyway. As someone else said, there are other manuals for specific systems which may be more useful. You should be able to find these online.