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Hello. My name is Tan.
I would verify the power is seized and not the lower unit. These engine don't usually seize from sitting. Now lower unit can seize from sitting if they have water in them. I have seen customers use there boat. Put it away for the winter then go back to get it ready and the engine be locked up. It turned out they had a leak in the gearcase and the lube leaked out and the lower unit ingested water. It sat and seized. So I would check the lower unit lube first. Remove the drain plug at the bottom of the gearcase what runs out?