[CREWZIN]

I'm pretty sure that the "update" that are talking about is the updated timing belt tensioner. Chrysler came out with a new tensioner for the PT in 2003 and advised anyone replacing the belt to also put in the new tensioner. The old one wouldn't keep the correct tension on the belt and "I guess" cause the new belt to wear prematurely.

There's no other update that I could find in a search. IMHO If that's the way the mechanic is talking, I'd search around for someone else with more experience with the PT to do the job.