Xite radio system diagnostic mode: grid line adjust

[teachdocs]

2019 Essex.
Backup grid lines are not aligned with steering wheel position.
How do you access the system diagnostics mode for the Xite radio?

I found a document for a Ram TRX but the buttons are different.

Does anyone know how to access this diagnostic mode on the Newmar Xite?

Document on the TRX for reference:

https://acurazine.com/forums/attachm...-mode-5190.pdf

Page 32.

Thanks!