Thanks, tried all that and the plans/administrators don't know. So thought I would also poll here to see if anyone had some pointers before going to tax specialist/atty. We are making rollovers to Able but since it's subject to annual cap, better if we can spend directly from 529,
I don't think you're going to find a detailed answer.
This phrase appears several times in Pub 970:
"Expenses for special needs services needed by a special needs beneficiary must be incurred in connection with enrollment or attendance at an eligible postsecondary school."
I'm of the opinion you'll know a special needs expense when you see it.