Flair;
What you now need to determine is which jowstick isn't in neutral position when the key switch is turned on which is the cause for the L222 fault. The one thing which Linde AG pressed home in their training programs was guessing at the reason one may be right 20% of the time and dead wrong 60% of the time. Therefor, for every code there needs to be additional diagnostic.
An L237 is saying that the safety processor is seeing a value for a potentiometer reading that doesn't add up to an acceptable number range.
The L255 fault is a issue in the electrical control circuit of the tilt function which is spelled out in the previous post. However to add the tilt solinoids are the upper and lower solinoids on the control valve block which are next to the two solinoids which have the metal data tag attached. also look closely at the 10 pin plug/socket connector of the valve block. The next place to look is the controller plug/socket along with the controller itself.