After graduating Tesla returned to Smiljan but shortly contracted cholera, was bedridden for 9 months and was in close proximity to death many situations. From 2014 to 2018, Tesla's Fremont Factory had 3 times as several Occupational Safety and Health Administration (OSHA) violations as the ten greatest U.S. In September 2019, the SEC questioned Tesla CFO Zach Kirkhorn about Tesla's warranty reserves and lease accounting.