Thanks!
I finally found the amplifier, it was behind the main coach TV. I'm going to try out the 80/70 psi levels for a while and see what the ride is like.
I have gone through the Mercedes manual that came with the coach and it does not appear that I have all of the functions that some of the onboard computers have. Some have buttons on the steering wheel and others don't. Mine does not and even after repeating the directions several times, the onboard will only let me change the time, so I am not sure if it will warn me regarding the blue def or not or not.
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