2188 with 853 row head cutting milo today. Error came up in the "A" post window...Header P2. Read in the book that it refers to header calibration. Stuck the row head over a ditch but not deep enought to completely retract the lift cylinders (need to hang it over the edge of the Grand Canyon to get them fully retacted,W/ the head on) LOL Anyway, tried to recalibrate and it wasn't real successful. Height window now only indicates fully up at 34......while down as far as I could go stopped at 4. Do I need to do a better job of calibrating or do I have something wrong?