The door ajar light stays on all the time and.

One of the door switches is out of adjustment. All have easy repairs but you have to determine which one is causing the problem. If the lights are staying on all the time, stand outside and push in on the back of each door to see which one makes the lights go off. If the lights are off, push out on the rear of each door from the inside to see which one makes the lights go on. That will determine the repair procedure.