It's been several years but I did send a 4003 in to the PC to have the action job done. It greatly smoothed up the trigger and reduced takeup. It was money well spent for a gun that I carry and shot a lot. I've still got this pistol, it is still one of my favorite 3rd generation pistols.
I also have a couple of Shorty 40s that have the most perfect trigger pull of any 3rd generation pistol I own. It's certainly worth the money if you intend to keep the pistol.
Atlanta_SW40: The action package is simply a trigger job that the performance center offers. It will reduce pull weight, takeup and make it down right smooth.
Cheers,
Sam