A day after Lukasz Krupski put out a fire at a Tesla car delivery location in Norway, seriously burning his hands and preventing a disaster, he got an email from Elon Musk.
“Congratulations for saving the day!” Mr. Musk, Tesla’s chief executive, wrote in March 2019.
But what started as a story about a heroic employee and a grateful employer has devolved into an epic battle between the carmaker and Mr. Krupski, a service technician. The fight has spawned lawsuits in Norway and the United States and caught the attention of regulators in several countries.
After initially being hailed as a savior, Mr. Krupski said in an interview with The New York Times, he was harassed, threatened and eventually fired after complaining about what he considered grave safety problems at his workplace near Oslo. Mr. Krupski, originally from Poland, was part of a crew that helped prepare Teslas for buyers but became so frustrated with the company that last year he handed over reams of data from the carmaker’s computer system to Handelsblatt, a German business newspaper.
The data contained lists of Tesla employees, including Mr. Musk, often with their Social Security numbers and other personal information. There were thousands of accident reports and other internal Tesla communications that Handelsblatt used as the basis for stories about flaws with the company’s Autopilot driver-assistance software.