03 sportster bad ecm?

[Flood]

rotax 155hp First time gonna use this season started right up 10 seconds check engine light comes on. Boat ran great last year before winterized. Brought to get serviced and check on computer. I was told i have a bad bypass valve 400$ ok do it. A week later boat still at shop im told computer is bad 1200$ engine only revs to 5000 rpm in water. Does any of this sound possible please help any advice