3423-13 - Grade Control System, requires calibration. I'm guessing this will require ET and I'm sure the calibration will not run until you fix the other 4 Codes.
2426-3 - Stick Angle Sensor, voltage above normal. Most likely a problem in the signal wire.
2425-3 - Boom Angle Sensor, voltage above normal. Most likely a problem in the signal wire.
2402-what exactly.? 2402 refers to the laser receiver
1952-9 - Chassis Angle Sensor, abnormal update rate. This happens when an ECM is expecting to receive information from another ECM but does not receive it.
I'll see what I can find for the Codes in the way of troubleshooting procedures.