Email, phone call, snail mail, in person...How should an author approach a professional, non-writerly person for help with their writing project?
Pretty much the same way you ask your parents if they can watch the baby while you and your husband go to dinner. Or asking your neighbor to check your mail while you're gone. Or getting the nice lady you work with to watch your cats.
You just ask.
The absolute worst thing they can do is say no. You've lost nothing but the few minutes it took to ask. The upside is that almost everyone will help you if possible.
Jeff