Started into next to last field of corn tonight, hit the 1 button to raise the head and it came up very slowly. So I shut the rotor off and tryed it manually and it would only raise with high throttle @ half the normal raise speed. Checked for leaks and oil level and everything was fine. Everything worked, no alarms or codes, just no normal raise speed. Combined to the end of the field and the main gear case pressure light came on, with the buzzer, then I noticed no power steering... Went and put on three new filters, now the head goes up and down normally but the light and buzzer for main gearcase pressure remain, also I have no power steering, fluid levels are good.