It's my year end and not enough TPs last year to maintain Silver

. My wife and I have a CE and CW booking in J in October - ABZ - LHR - SJC and LAX - LHR - ABZ - which was booked before I dropped to Bronze and I have already booked our seats. I understand that as long as I do not go online and alter the booking the booked seats are likely to be honoured although if I change my booking the booked seats may disappear. If I go online to pre-book our meal will this constitute a change resulting in the booked seats disappearing