Ok, Spent some time on it this weekend. The trunk lock was not working with the power locks because it wasnt connected to the diaphram (is that the right term ? ). If it wasnt for this forum to give me enough self-confidence to look it up myself, I would have probably left it like that!

Still though ...
I played around with it a little bit and the behaviour is almost consistent. Locking and unlocking the trunk, locks and unlocks all the doors but the driver.. But if I put the key in the drivers door, I can lock/unlock all the doors. If I had a leaking solenoid or something, shouldnt the driver door not be able to lock the other doors ?