Audi A5 Coupe - Door open light on dash?

Hi

I am hoping someone can help as I have an issue with a door open light on the dash.  The lights can been seen still on from under and side of the door also.

The door cannot lock with the fob but I can lock it with the key.

Last month I had the common problem of the door not opening the drivers side and so replaced the drivers door actuator - this solved the problem and worked well for 4 weeks! 

Now the issue above - some seem to say its a microswitch for locking  - am i unlucky and the new microswitch on my actuator has failed or is the switch somewhere else?  Or another problem.

Audi 2008 Coupe (57 Model) - 3.0 TDI Quattro 

Any help appreciated!