Electric car maker Tesla Inc. is expanding its service operations and hiring more than 1,000 technicians to meet expected demand for its new Model 3 sedan. Deliveries of the Model 3, which is cheaper than Tesla's existing cars, are expected to start this month. The car is expected to attract hundreds of thousands of new customers to the brand. To accommodate them, the Palo Alto company is adding 100 service centers worldwide over the next year, bringing its total number of service centers to 250. The new service centers will be in areas that have the most reservation-holders for the Model 3. Tesla also is adding 350 vans to its mobile service fleet, mostly in the U.S. The vans go to owners' homes or offices and repair their cars while they wait, typically for about one hour.