That would run face first into proprietary info and corporate classified info.

The other side of regulation should be around purchasing. Bad repairability, delays in repairs, and proprietary parts need to be more important factors when deciding on what device to buy. Either at the government level for public institutions, or at least at the corporate level for private

That would run face first into proprietary info and corporate classified info.

Behold all the fucks I do not give. If it's that critical they lose all claim to being proprietary. It's just like patent, there's no such thing as a secret patent, so anything that safety critical doesn't get to stay secret either.

Regulation won't detail what a company does to that level. They might say something like "fasteners shouldn't come loose" but it wouldn't have a torque spec.

It doesn't now but it's utterly trivial to fix that. Just make the regulations say that components must meet the manufacturer specifications and require manufacturers to publish and maintain all the specifications of all safety critical components. If they want to keep it secret then that means it's not safety critical and they're responsible for any accidents resulting from its failure.

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.