BMW 7 series F01, F02, F03, F04 from 06/2008 onwards with Start/Stop function.
We have replaced the evaporator in the above Model on 7 occasions within the past 6 month.
It appears that the quality of the evaporator is the same as Mercedes S class WDB140 chassis which suffered from the same problem.
The following photos show the work needed to carry repairs by replacing the evaporator.
Classic Cars Air Conditioning Specialists.