Talk to your repairer how they are going to fix it before getting them to do the job.
If it is a multi layered modern board are they going to replace the layers of high density foam and glass/carbon such as how the board lady does?
A friend had a board repaired, fairly new board with typical modern layup (carbon wood pvc etc) - they just cut the damage out, put a few layers of glass over the polystyrene core then bogged it up, faired then sprayed.

Many board repairers are from the old school surfboard repair crew - most know nothing about modern windsurf board construction.