For me it looks like tilt potentiometer.
Errors 225 and 490 indicates that the problems are there.
280 is an internal module error linked with the lift, but it means again - tilt potentiometer.
May be calibration problem, but according to my experience, most likely it's simply the defect.
Concerning the pins - of course I mean the connection between N1 module and the potentiometer pins (look at the mailed pictures)
I will send you some catalogue picture, where this poti is shown and part of the electric plan showing the module N1 and the poti (2B3)
You must only choose the part in accordance to year of the truck production.
Until 2009 the part No is: 3863604700
After 2009 the part No is 3003604700

Hope it helps