when sending a T dialled model to Panerai, for service. They would probably substitute the dial with a Luminova one, since Tritium is a no-no material, these days. Before you even consider sending it, make sure you obtain IN WRITING the assurance that the dial won't be substituted
That being said, TS1987 is absolutely right; why give Panerai hundreds of dollars to service/repair an old, out of warranty model, when your friendly, local watch repair shop can do the same for a..song and a dance?