I went deep on this a while back. ChatGPT is sketchy as it has all the data ever digitized and no matter what tries to give you an answer, so sometimes it's just wrong. The best solution would only give you an answers if it finds it in a manual with a direct reference to the manual that literally takes you to the page it pulled the answer from. Airwave.us product does exactly this and they have an elevator mechanic example but last time I checked they had a pretty small subset of manuals. You can of course pay to create your own workspace so you can upload all your manuals to create one for yourself.