Welcome to the forums! There is an archive of manuals on the Dutchmen RV
website, however their site isn't working tonight.
However you are not going to find much useful information in the owner's manual. What you need to do is a make list of your appliances, make, model and serial number; then hit up the various manufacturer websites.
If you can't find something come back and ask, someone may have a copy, or know where to dig one up.