I was just reading the thread about the 4x4 light not coming on the dash, and about the self diagnostic actuator test (push and hold trip reset and turn the key to on position). Turns out the light does work on mine, so it's the switch.
Anyway - before the gauges and lights all did their dance, 2 things popped up on the display.
The first said "5 of 5.1", then the next thing to pop up was the number 308292.
I have spent half an hour searching - but I can't find anywhere to say what these numbers mean.