The invaluable part of the Service Manuals that Bunsen cited is that they include P/N lists / Only the Service Source (repair) portions appear in the standalone .pdf manuals.

Click to expand...

Actually, the early Service Source CDs had the part numbers and stuff too. I have a genuine June 1996 Apple Service Source CD, which has all the service manuals for all Apple gear (excluding Apple II and Lisa series machines and related peripherals) made up to June 1996 in PDF format, and at the end they have a section called "Parts" which lists all the parts used in that product, with a photo, discription and AppleService part number.