Have you physical taken the cluster out and looked at it. I recently replace all my bulbs for the back lighting. As well as the AC backlight, giving them a tap made them light up. Till it would no longer come back on.
NBP/E 2002 MDX Tour/Navi
SS, SG, BSM, Front Air Deflector, Philips Xenon 4,100k HID conversion for Lows, Sylvania SilverStar for Fog Lights,04 Spoiler. Finally, Alpine CD/MP3 Changer, Panasonic DVDPKG2 RES, SAM UNIT, rear camera, Alll for my Beautiful, daughter. Installed Wood Steering Wheel. whew.