Range Rover Battery Drain

I have a Range Rover L322 05 plate. The near side, side light seems to come on and off at will. Causing the battery to fully drain overnight. I have already replaced the headlamp module because the main beam bulb was coming on. That now seems to be fixed, but does this mean I have to replace the sidelight module as well? Any advice would be greatly appreciated. Joctaff
Dose anyone think that there maybe another electrical problem which is causing the side light fault?

The lights should be controlled by the Light control module

Don't recall them being different modules
Just one ECU for lighting