Might try Mike Evans for your engine survey, Evans Engine Service 425-238-3323. He came recommended by Boat Haven Marina staff as "the guy" to do a pre-inspection for a recent vessel inquiry. Charges about a hundred bucks an hour and is based out of Port Angeles if I recall correctly. He'll pull oil samples and send them in if requested, but you can do that too. https://tinyurl.com/oil-sample-conditions.
The sample will provide a baseline for future comparison. They'll mean less if you don't have a record of or engine hours since the last change. They'll be more useful the next time you do your own testing. Mike will tell you if he thinks it'll be a waste of your time. My $180 bucks netted three items to be aware of going forward. Simple stuff in this instance, and better sleep at night knowing someone more experienced than I had a good look.
And he'll measure the Alternator output as part of his inspection.
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