I understand. UA agent worked on the 12 segment ticket to ROR/TKK manually last month and then re-issued the ticket. I trust they must have accepted the changes on the AC segment YYZ-SFO.
Nonetheless, AC.com is still blocked. Meanwhile, BR.com (final inbound) does not show any schedule changes.

*Oh - UA.com shows 2 PNRs for AC (before and after the migration). The old PNR had another AC HNL-YYZ leg (the only AC leg before the migration) that was removed from my itinerary 6 months ago due to a major schedule change and broken connection; for whatever reason, that HNL-YYZ leg stayed under that PNR on AC.com (last time I checked right before the migration). The AC YYZ-SFO leg was added by UA after the migration and the new AC PNR is the same as BR's PNR. I wonder if the reason AC.com doesn't clear is due to the schedule change of HNL-YYZ which is no longer part of my itinerary but is still under the old PNR...another bug