Just also got upgraded 3.5 days out on AA136 LAX-LHR

EXP using Miles/Copay - switched to SWU when saw the record was locked on aa.com and my agency record showed confirmed on the AA/UPG segment. Agent said not an issue to do this as processing hadn't started to charge copay and remove miles

This was holding at J=7 on ExpertFlyer last few days with about 11 actual seats open. Switched to J=4 today and didn't catch C=x - was still zero when I checked this AM... Seeing J=4 made me think I may have cleared (or other may have - look at AA.COM and see record locked and then see Agency record shows confirmed)