Well, at minimum the display part of it, the 'panel', will have to be replaced in a shop. Probably not something you can do yourself.
As for whether it should be repaired, or replaced, that depends on a simple question of economics (as far as I am concerned, and being in ignorance of any other facts or preferences of yours that might enter into the decision...):
- how much does it cost to have the panel replaced, as opposed to replacing it?
This can be determined by contacting a shop that could service this problem with this device, and getting an estimate of charges for the repair from them.
Then you factor in, that the repair, if done, may not be permanent - may not last as long as a fully warranty-covered new unit would be likely to - and that something else may go wrong that isn't the screen, in a 10-years-old device (in the S. FLA climate, too... electronics don't like heat, though military-specification devices can stand it).
Let me know your local zip code, and I will give you contact information and addresses for nearby shops in your region that you might take it to for repair, and that you certainly could ask for an estimate of repair charges.