Thanks for advice. Yes Fiji CC. As NB I haven't been able to get through to HBA or AKL so far this year, that's with many calls. I will call a few more times to see what they can do. Just a bit of difficult when I am at work with the long call wait times. It has happened to me 3 times previously, some years ago of course, with cancelled flights and QF requested that BA open rewards seats on other flights even though none of those cancellations involved BA. Fingers crossed. BTW restart of QF SYD to SFO flights pushed back to end of Oct.
Update: After 2 drop outs I got through to Fiji after 1 hour. She spoke to her support team as I waited for about 20 mins. They will put a request through to AA to release a seat. I suggested 2 flights that would suit. It will take 24-48 hours and she said they will call me back. I won't be counting on the call back though.