In case someone finds this via a search (Google or otherwise) in the future, I called Freightliner support and they now have determined (confirmed with the tech on the phone) the following:
1) The MMDC for these affected chassis/units reset the dash odometer to 0 (zero) miles EACH time the odometer hits 50k miles
2) The process for obtaining the actual ECM based mileage vs the dash without any scanning tools is:
(this applies to coaches with the black/charcoal information panel with the "T" - "Red Dot" - "H" on the left and "Up Arrow" - "E" - "Down Arrow" on the left design; unsure of others....call Freightliner
)
Turn the key to the Run position
Using the information center buttons (I had to start the engine and wait for the air bags to come to min pressure before I could get beyond the low air pressure alarms)
Hit the Home button ("H")
Highlight "Service" and hit Enter ("E")
Highlight "Diagnostics" and hit Enter ("E")
Password is always "8127"
Hit the "Up Arrow" TWICE on the "I/O Screen" to see the "ECU VS IP ODO DIFF" screen
Top number is the ECU mileage
Bottom number is the dash odometer mileage
Again, HTH someone - happy travels 8)
-Patrick