2:434 is " +15V for external sensors over +16.5V "
Specifically mentions conductor 29 being possibly shorted to a conductor with higher voltage than 15V.
Maybe re-check your broken wire repair and/or check that mast sensors B18 and B19 are not damaged and function correctly.
Do you have a CAN Key??? It's available as a service part and allows you to monitor sensors etc. as they perform switching etc. It will also allow a person to completely scramble the truck's brain, so it must be used extremely cautiously!! Suggest you have a conversation with your local dealer/tech soon, so as to get the correct CAN key if you don't have one.

You really need a service manual at the very minimum.