I think your error message is saying there is a problem between the level sense (controller in the cubby) and the key pad beside the driver. If the cable between them checks out OK (all wires and contacts are good) then it sounds like either the controller or keypad has failed.
I would suggest contacting Lippert tech support and see what they would suggest. That's like asking a barber if you need a haircut......but hopefully they will know from experience which is the more likely failed unit. Ask them about the 10vdc at the keypad. If the controller is only providing the keypad with 10vdc (I don't know if this is normal) then perhaps the controller is more suspect.....but that is a WAG.
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