I seriously doubt you're in trouble. I imagine they just have a question about something that might be a copyright problem or a file that didn't come through correctly. Just call them and not to worry. WHat are they going to do if you did do something wrong? Take away your birthday? Break your pencil? :0)
BTW, I sure would be interested in getting that 866 number you mentioned. I'm trying to find a souloution to a problem I'm having with a book having been in Review for over a month and a half!
I think we all would love to get ahold of that phone number!