went to local office by infopass, where no interim EAD will be issued, I was told I cannot expedite within 90 days, then I faxed request on the 90th day.
I think some other local offices are better since I saw several people sent our expedite reuest quite earlier and got approved within 90 days.
search "sagogo" for sample letter and fax number. good luck to friends in NSC!