I sure that the operations side would like to get rid of the 2 non standard aircraft. ie: OO-DIB & OO-DIC.
However when the bean counters get at the numbers I expect they want to get rid of the two cheapest ones.
Shortest remaining lease time, Least penalty clause, Heavy maintenance due, will all come into the equation.
Heard a rumour that another A/C might be parked and OO-DIB re-instated.
As for ball mat problems, Channel Express engineers used to dismantle and clean the ball assemblies at the weekends in CGN. An ongoing program to ensure reliability.
Our man at LHR knows all about it. They made up some tools to avoid all the bending and kneeling.