Elon Musk said on X that he'd investigate rising rates of illness at Tesla's Berlin plant.Christian Marquardt - Pool/Getty ImagesTesla workers in Germany have received home visits from managers when out sick, a German newspaper reported.Handelsblatt said illness rates at the Berlin Gigafactory are over three times the industry average.Elon Musk says he will investigate the high sick leave rates.Some Tesla workers have received visits at home from managers while off sick, according to a report from German newspaper Handelsblatt, which cited a recording of an internal meeting.Handelsblatt said that when receiving such visits, some workers threatened to call the police, and others slammed the door in the managers' faces.This coincides, Handelsblatt reported, with the rate of employees at Tesla's Berlin Gigafactory who called in sick jumping to 17% in August — over three times the average for the German auto industry last year.Dirk Schulze, a regional chief at the German metalworkers' union IG Metall, told Bloomberg the apparent home visits were "absurd."He added that Tesla workers report "extremely high workloads," with management pressuring those who are out sick as healthy employees are overloaded with additional work.Elon Musk has said he will investigate the report."This sounds crazy.