Dick,
Welcome and congrats on your first Parker.
I think Bob Harris' recommendation is a good start. In the event there is no recommendation locally to you, possibly a member of that org or this board that lives in your area with some experience and a wall thickness gauge can help.
The evaluation you seek is straight forward. It consists of a visual examination for bulges, dents, cracks and heavy pitting from rust. I also believe you can do this yourself with some help from this bbs and a wall thickness gauge from Brownell's (about $100).
