Originally Posted by
erwin123
... Is this caused by the schedule change I got earlier ?
more likely this
However, the upgrade was kept intact on the IAD-PDX portion

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Never change a flight online once your have been upgraded -- the risks are too high. Always call.
Also if you change the TATL to P, the changing the domestic to P (returning your RPU) may not increase the price. Ask.
Also, in general doing a fare break ticket is best left to agents.