Had my SFO-EWR 7898-10 - which I booked on purpose to experience - switch to 777. Went from first row in Premium Economy (which I was able to select for free with Y ticket) now to E- seat. How on earth do they reassign these seats? How does a 1k in Premium economy go to E- in the back? Just totally random?
Of course, you call and they will do nothing for you......always so thoughtful and caring in these situations.