Hi
This is my first post and its quite long so i'll say hi and crack on.
I own a 99 528i called betty who has developed an annoying problem.
Neither rear doors will open from the outside

The central locking works and the actuators appear to work fine. I have stripped it down and oiled the locking mech but no joy. The cable from the ext handle to the locking mech seems to have lost tension but i cant get to the source i.e the ext handle as the back doors are 'double skinned' and it requires a bmw tool to remove the ext handle.
To make matters worse after several hours trying to fix the problem i ended up breaking the inside handle on one side and engaged the child lock on the other so i cant use either back door full stop.aaaahhhh!
Dont fancy bending over for the dealer so any help would be appreciated!!!