sparkyconnect

Hi ya. This is my first post. I have an 07 T200 swb connect and just over the last few days the interior lights have been flickering on and off. the switch on the front fitting is in the off position. Is this a common fault or a faulty door switch maybe. whats the easiest way of getting to the door switches. I cant see anything on the door pillars that looks like a switch. Any information would be very gratefully received. Thanks sparkyconnect.