(Portland, OR)  --  All is reported to be well, after a nonstop Alaska Airlines flight from Hawaii to Portland was sent back to the islands.  Officials say Flight 862 was rerouted back to its origin point after a warning light came on in the cockpit about 90 minutes into yesterday's flight.  The light indicated there was a problem with a backup auxiliary power unit, so the pilot turned the plane around.  The jet landed safely in Honolulu around 4:30 local time yesterday.