Just to be sure I tried Al-Yeti's suggestion (thanks!), but to no avail.
GalaxyGuy, thanks for describing the normal behavior. The way I first understood it was that you were talking about the LED of the Keypad. But I think now you meant the PCB and it behaves exactly as you described (quick flash, 30 or so seconds dimmed, then steady light - and I had disconnected the KeyPad).
Then I reconnected the Keypad and waited for about two minutes and then, after scanning the bus, the Keypad started showing initialization information about timezone and region, then rebooted. So, much progress, thanks!
Tomorrow I'll continue (need some rest now, 0:30am :-)
Cheers,
Bram