Battery draining
 

It takes 1-2 days for the battery to drain completely on my 2006 Mazda 3i sedan.
The mechanic says that the battery, alternator and starter are OK and that I have some electrical problem around the drivers door.


Also - my "door ajar" dashboard light is ON all the time even tough all doors are well closed.

Earlier this year I was replacing the cabin filter and disconnected some fuses but I re-checked them and they seem fine.
I don't see any other lights that stay on when the car is off.

Can this dashboard light be draining the battery?
Would you replace the entire door lock to fix this light?
What other steps can I try to find the battery drain source?

Thanks!