I had a fault with a rear air tank sensor (micro-computer) and when I picked the rig up from Freightliner in Sacramento, CA I found the odometer has 43,000 less than when I took it in. The tech couldn't explain why it happened, but stressed that federal regulations prohibit adjusting odometers. He was able to get the correct mileage from the main computer and deducted the present odometer reading from it and posted the difference on the entry doorpost. It is frustrating because I understand why no messing with the odometer, but, gollie, I wanted to PUT 43,000+ miles back on, not take it off.