https://store.steampowered.com/app/1011420/Bus_Mechanic_Simulator/

From now on you can get in the position of a mechanic in Bus Mechanic Simulator! Maintain and repair original MAN buses in a realistic garage and interact with up to 3.400 parts. You have countless tools, a test stand and three pits at your disposal. What are you waiting for? Get dressed in your boiler suit and get your hands dirty! ????