1; Sometimes. They are refurbished by the manufacturer.
2; Maybe, depends on where you are.
3 ? The tech will know if the light is good or not.
4: you will be provisioned on what your service requires.
My horse fights with me and fasts with me because if he is to carry me into battle, he must know my heart and I must know his or we shall never become brothers.
-Plenty Coups, Chief of the Crow