I would say someone who can blueprint the neck to the shape and dimensions as it was originally designed. Actually my tech, who is very good at dent work, is the one asking me if I know of anyone who would be qualified in this way. He was witness to the adjustments Mark Aronson did to my Super 20 bari neck and crook which solved a serious intonation problem, after he had done the dent work. Aronson knows Super 20's and had the information to return the neck to exactly its original dimensions, beyond just getting the dents out.
I haven't seen the neck, just thought I'd ask here if anyone had recommendations. I will of course give him Aronson's contact info, but I'm sure there are some other neck specialists and possibly someone who has an affinity for Martins... Thanks.