Is switched as a pgy3. Sometimes programs have spots because their pgy3s leave to do child psych. I did look on the APA site but I actually emailed the program director of the program I was interested in, explained why I wanted to switch and I'm in that program now. I think it did help that i interviewed there in the past and didn't match (I ranked them high enough, they didn't do the same) so they knew me. (I interviewed there multiple times). I didn't go through ERAS or anything.
Good luck to you.