Looking at purchasing a 41' Trawler that has been in a boatyard for two years out of the water. It's a mid 80's Taiwan boat (Defever design). What if any issues might I see due to how long it's been out of the water that a survey may miss?
Replace all impellers.
Raw water pump seals will be leaking.
Burp your dripless packing.
Toilet seals need replacing.
Verify steering fluid level..
Flush and replace antifreeze.
Change all engine oils then check for leaks.
All fuel and oil filters need replacing.
Check engine belts.
Verify all temperature readings are "Normal".