Think Mercury are on top of fully marinising their motors for corrosion was told a few days ago.
Planenutz has a good point where the first place technician should be looking at that relief v/v. Think most outboards have them and think that's how you bleed system on some as well by lowering down with cracked then tighten up.
On the brightside it's probably not much if it's still functioning fine, just annoying when new. Boat places so busy at the moment selling stock they don't even have yet service may have dropped off.
Good outboard mechanics do seem like diamonds though, everyone always bitch'n looking for a new one! ha ha
They should have good back up though on specific problems like that they can go back to manufacturer for advice where to look.
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