(Bloomberg) -- Tesla Inc. Chief Financial Officer Zachary Kirkhorn stepped down after 13 years at the electric-vehicle maker, a surprise shakeup that raises new questions about succession in the top ranks of Elon Musk’s company.Most Read from BloombergMusk Says He May Need Surgery, Will Get MRI on Back and NeckTexas Power Prices to Surge 800% on Sunday Amid Searing HeatPayPal Launches a Stablecoin in Latest Crypto Payments PushUkraine Black Sea Drone Attacks Signal Rapidly Expanding WarHSBC Exec