I have to tell you that at the last minute, I opted NOT to send the gun back to S&W. Packed it up; put it in the car to take to the shipper and changed my mind.
My reasoning is frankly self-centered, but it goes like this: My 329 did have an action job from Jim Stroh at Alpha Precision, who does the action work on most of my working S&W revolvers. Jim by design DID NOT touch any of the lock mechanism during the course of the action job. However, there was a better than even chance that S&W would point to the action job as the culprit in the jam. I did not want to drag a friend of mine into a potential confrontation with a major gun company. Secondly, Jim asked me for the gun back for him to check over.
I decided that because I bought the 329 used on the retail market and commissioned and paid for the work on the gun myself, Jim should have first crack at it.
If this had been a stock gun provided to me by S&W for test and evaluation, I would have acted differently.
BTW, S&W does not sponsor my shows or my Internet projects.