Parasitic Battery Drain
 

Mk5 Golf 2006 1.6 FSI Auto.
I have a parasitic Battery drain which occurs through 2 fuses in the Passenger Fusebox (12 (10amp) & 23 (30amp) I believe).
Both these fuses are related to the Door Control Modules.
Removing both fuses stops the battery from draining.
All Door & Windows functions are working normally on all Doors.

Are these modules DIY replaceable?
or do they need coding after replacement?

Is there a common fault that might explain the drain?