Another break-through this evening: I found RX/TX on the connector. I think Electrolux deliberately made this tricky!!
The primary serial port on the CPU goes off to a hex inverting schmittrigger all tracks very hidden. This means that we don't have to do any soldering on the board, and infact, everything we need are available on the red connector.
I'm getting a bit low on energy now, but here's the complete mapping of the connector.
'*' is active low/inversion sign in table below.
2. +V Battery through 10R
5. *IPIPE/DSO through 220R
7. *IFETCH/DSI throug 220R and 22K Pull down
11. *BKPT/DSCLK through 220R and 4K7 Pull up
13. *BERR through 220R and 47K Pull up.
14. NC (goes to unpopulated resistor R68)
Numbering as specified in Links excellent picture earlier (helped me a lot!).
As you can see, pin 4 is still a mystery. I goes in an inner layer, so it is impossible to see where. I *think* it might go to the battery/charger area of the board, but I am probably mistaken.
Next task for me is probably to make an interface board, which gives correct rs232 levels and a standard debug connector.