To get to a repair manual, you just need to visit Apple's Self Service Repair website. From there, click on the "Apple Repair Manuals" link under "Support." ...

Device Manuals This bare-bones site has a Google-esque approach, saying to "search your device brand and model" in the initial search box. It was able to find the instructions for one of my items ...

Ifixit.com, for example, is “the free repair guide for everything, written by everyone.” As of March 2018, it offered 37,192 free manuals and, 122,145 solutions for over 10,570 devices.

You can go directly to Apple's manuals, or there is a prominent link on the new repair store. The direct and store links both take you to the same list of all Apple manuals, whether for repair or not.