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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.
Proprietary information and corporate classified information do not exist once they are incorporated into the device and sold to the end user. That information now belongs to the end user, who will continue to need it even if the company is out of business, or refuses service to the owner of the device.
Any attempt to conceal that information from the end user should make the company liable for any failed repair performed by any individual, including harm arising from that failed repair. The only way to avoid that liability is to release all information to the end user, so they are fully informed when making a repair decision.