I spoke with my contact at Lippert and this is what they sent me about the external sensor issue you have:
External sensor error means there is an issue with the rear leveling sensor. This will be located 2-3 foot behind the rearmost axle. There may be an access panel in the underbelly, or there may not. Typically this error is due to a bad connection to the sensor or the sensor itself is bad. I attached a picture of what the sensor looks like in the second picture. The first picture is... view full answer...
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