Thanks. I think my take on this is just different. If we focus on the case brought up today which re-started this thread, we know that the manual is in our inventory, because the external auditor found it. Ironically, had the company hidden or trashed or recycled their maintenance manuals, the auditor would have nothing to write up...
If you benefit from having a list that tells you where the maintenance manuals are located, good. Most organizations that I know would consider that an unnecessary bureaucracy. Hopefully people doing the maintenance will have access to the manuals. Unless they have all been hidden, so the external auditors have less ammunition for write ups.

Occasionally calling the OEM and asking if the manual has been revised. Not a bad idea. I wonder how many organizations do that...Or if I don't do it, I must be violating an ISO 9001 requirement...which one....I am not sure.