Nothing specific in terms of a repair place, but I’ve had good repairs/mods* done in the past from “general” workshop places by just showing up and explaining what needs to happen.
I mean, aside from a dedicated technician, most wood/metal workers can do what needs to get done.
*I had a stainless steel fretboard made from a metal scrap place
*Bought 316L stainless steel to make a cymbal with
*Had someone weld together sections of a monome drum mount/stand