This week, we had a fellow cover driver (with more seniority than myself) not work preload and then come in to drive while he was on a scheduled vacation week. We both usually work preload and drive after. I didnt drive Wed-Fri, but he did, nor was I asked if could drive. I was told by a fellow cover driver that I should file, that mgmt shouldve asked all available cover drivers first, then ask someone who was on vacation. I was unable to ask my steward on friday. Ive looked at the contract for this rule. Any help or advice? Thx