More than likely the best place to send it in for repairs is S&W. They made it and it is sort of a "freak" - being a 9mm Revolver. I question how much the average LSG knows about them (although it's not Rocket Science) and would highly doubt that they would have any parts if they are needed in the repair.

The other think is your M547 might actually be under the Lifetime Warranty - I don't know when it was made.