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Trained repair professionals at hospitals are regularly unable to fix medical devices because of manufacturer lockout codes or the inability to obtain repair parts. During the early days of the COVID-19 pandemic, broken ventilators sat unrepaired for weeks or months as manufacturers were overwhelmed with repair requests and independent repair professionals were locked out of them. At the time, I reported that independent repair techs had resorted to creating DIY dongles loaded with jailbroken Ukrainian firmware to fix ventilators without manufacturer permission. Medical device manufacturers also threatened iFixit because it posted ventilator repair manuals on its website. I have also written about people with sleep apnea who have hacked their CPAP machines to improve their basic functionality and to repair them.
PS: he got it repaired.
Yes, dangers exist from third party repairs.
Refusal or even simple failure to provide critical repair data to the end user or their agent denies the end user the ability to make an informed decision about repairs.
The company should be liable for all damages from a botched 3rd-party repair unless they provide to the end user complete specifications and unrestricted access to the device in order to make informed decisions about repairs.