Leadie, while I do not support silly AD's, I also have trouble understanding 3 months to do the job?
There is three years to get up to date so surely during a suitable maintenance check this could be done at the same time without having to be a 3 months overhaul.
I too wonder about the data backing this, the FAA have not issued any AD's and while I understand how the problem starts at time on manufacture of the cable (well before the installation and plane manufacture in many cases) they do not do anything to cover this large variation in reality.
If CASA really had a severe concern you would think they would work hard with the FAA as the worlds biggest regulator to apply sensible outcomes.