I had the same problem on a 1480. Found a pressure relief pilot valve seat worn which dumped enough oil so the priority valve had no excess fluid to run anything but steering and header lift, nothing left over for reel lift and auger swing.
The wear is even hard to detect with a magnifying glass, but slight leakage at the pilot seat will make a huge leak at the slide valve the pilot controls. with the valve mounted on it's side, the ball hits slightly below center on the seat hole.
After hitting slightly below the hole a million times and rolling into it, it finally wears the hole slightly oval, causing that slight but killer leak.
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