I'll give ya this much I've found...
If you wanted to come up with a way to try all the combos without damaging the buttons, you could use relays and a computer to press the buttons. Pinout as I measured it...
Power 1 and 2
Left 5 and 8
Right 4 and 6
Up 4 and 7
Down 5 and 7
Config 4 and 8
Enter 5 and 6
Scan 3 and 8
Mon 3 and 7
Data 3 and 6
+3.3V on pins 2,6,7,8