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Fault Codes and now will not go into gear.

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Last season I dropped the boat off at dealer after receiving "ENG FAULT" then "CHECK TRANS" on the screen. I checked the v drive fluid and the transmission fluid and everything are fine. This code goes off when I back it off the trailer and hit roughly 1000 rpms so I know that it couldn't be getting hot. The code is SPN 65701 CM 0 --- DIAG CODE  FM! 31 OC 1. They supposedly found the problem with the alternator, replaced it, cleared the code and winterized it. I got the boat out of storage and put it in, the same thing, the boat was running fine, just throwing the code. I took it back, and before they could look at it, someone wanted to look to buy it even with code. I went to get the boat and put it in the water and now will not go into foward or reverse. NOTHING!! ANY HELP.\... PLEASE

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