Sorry about that. It seems like your A-file has been transferred to Seattle. Congrats! I’m sure you will hear about your oath ceremony in the next few days or so.
18 months from the date they had their N-400 interview actually. LIN has some ridiculous timelines..
I use this link to track I-751 timelines: https://www.visajourney.com/timeline/liftlist.php?op5=5,9,10,11,12
Mine is also pending on day 530, and I have already passed the N-400 test on 10/28.