If the unit is under warranty, which sounds doubtful, send it to raymarine, otherwise it is probably cheaper and easier to buy a new unit. I believe the new ST60+ will probably work in its place.
Contact Raymarine and find the closest dealer that may be able to perform a repair! Send it off and get a cost estimate for repair versus change. I got the internal of mine changed for less than 50% of new including shipping in Singapore, but that may be a bit far off!
If the unit in question is OE to the boat, then it is at least 11 years old. I doubt that parts will be available, as the Raymarine Tridata has gone through several revisions in the intervening 11 years.
Definitely goto Raymarine; they will quote you a price to fix it and if that is too high sell you a replacement at a price below where you can buy it in the store. There is zero chance its still under warranty.
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