Air brake issues

I had this happen to me on my 2001 Newmar Kountry Star w. Cummins on a Freightliner chassis. What I found out was the microprocessor for the rear air tank became faulty and caused the guage to go to zero, setting off my alarm and scaring the ----- out of me. it would return to normal pressure and do it again and again. Freightliner replaced the processor. When I took it to Freightliner, I had 90000+ on the odometer. When I picked my rig up, it had 46000 on it. The problem was that the microprocessors for the rear air tank, dash and engine (where mileage is stored) miscommunicated and put 45000 on the odometer. Neither Freightliner or Cummins could legally restore the mileage because of federal regulations. Solution? Sticker on door noting to add 44000 miles to the reading on the odometer. Both techs knew how and could fix the problem but legally could not because they didn't want to loose their license. Know and check your mileage before leaving the facility.