The pioneering electric car company Tesla has suffered a series of very public challenges since the beginning of this year. Its high-profile CEO Elon Musk called this a period of “production hell”. Most of the troubles revolve around the company’s Model 3 sedan, its first mid-priced, mass-produced electric car. Musk takes “CBS This Morning” co-host Gayle King on a tour of his Silicon Valley factory. It is the first time network cameras were allowed inside the production line.