Finally was able to have someone take pitty on me today with my voicemail and return my call. I somehow managed to get the cell phone number for one of the engineers that designed the system. Looks like my original thoughts are correct and the MMDC is bad. Luckily for me the '09 unit that I found online will work with my system. According to him the difference in the 2 units is that they put a backlight input wire on the MMDC that dims the dash when the nav lights are turned on. Couple of other changes are improvements to the operation of Perfect Pass. So I guess its my lucky day!!!! Hopefully the MMDC will show up and save my weekend!!