Found a hole corroded in the oil pan water jacket. Luckily the hole only allowed water to spill back down into the drive shaft housing and wasn't a beach into the actual oil.
I plugged the hole with an aluminum plate and JB weld, hopefully to get me through the season. I'll perhaps do a more...
My last trip of the 2022 season I was idling around trying to find a spot to fish and the overheat alarm went off. I did what any reasonable fisherman would do and dropped anchor and fished for a few hours! :) When I pulled anchor and drove back to the docks the engine never over heated.
So...