I don't think the transmission needs to be replaced, and I don't think the dealer performed any real diagnostics. I also think it's an electrical issue. I picked the truck up from the dealer and took it to transmission expert. @newdude He pulled all of the codes (see attached). He says he doesn't do electrical, so he dropped it off at someone who does. I'm waiting to hear what they have to say. I've read about wire harness rubbing/chafing with these trucks that causes electrical problems...
Colorado Codes from Precision Transmission.pdf
Those are famous for a water leak right into the right side fuse block and will cause everything you are complaining about. The fuse block is under the right side of the dash and the connectors will be corroded and green if its a water leak.
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