Originally Posted by CappuccinoAddict

... To check upgrade availability, run a search as if you were going to book that flight. Search for the specific segment by itself, even if you have it booked as a larger itinerary. Since you have expert mode enabled, you should be able to see how many seats are offered for sale in each fare class. Note that the max you will see displayed is 9, even if there are more than 9 seats for sale in that fare class. The fare class that determines economy->business upgrades is R. If you see R>0, call in and ask that your upgrade be cleared.