The only diagnostic repair manual for the portable units that I have seen available on the web so far is [URL="http://www.guardiangenerators.com/PublicPDFs/0F7713.pdf"][U][COLOR=Blue]this one - the 0F7713[/COLOR][/U][/URL].
If this manual is not appropriate, you could contact Kelly Myers at Ziller Electric to get the hard-copy manual you need ordered.
I have that manual. I don't know if it is correct for the 5735 or not as I do not know what has changed, if anything.
Thought about contacting Ziller but hate to bother them as they don't sell portables.