Here
Posting in case it's useful for anyone else.
I found the initial description on p.5-8
really accurate (my 7yo DS has a dx of ASD with a PDA profile) - particularly the stuff about coping fine with one situation but totally falling apart in a seemingly similar situation on a different occasion.
Also the explanation of demands including self-imposed expectations (p.8) - I've been trying to articulate this for ages but haven't seen it expressly acknowledged in any of the stuff I've read before.