I have no idea what all those codes mean either, but it sounds like they gave it a thorough going-over, which is great. The strain screw backing out would explain light strikes, and that's an easy fix with some blue Loctite. The part I'm most interested in hearing about is how it handles the various 357 grain loads after they did some forcing cone work. Hoping you have good results here without any shavings or blowback. The few times I've used the S&W warranty service were all good experiences, never ever had to send anything back a second time, so I'm optimistic, and hope you have a good report to share soon!