So the ability to use a GPU on the KWA to MAJ leg is now gone (it's for Monday's hopper so maybe it's gone because check in available for those starting out in Guam) , but still says I can use a GPU/RPU/Miles to upgrade the TKK to GUM leg and when searching expert mode United says no fares are available in J. Worth noting, however, that once an instrument is selected, there is no continue button anywhere on the page to go through with the upgrade. May just be a glitch with United's new website.