Excavatoree, a member here and who wrote those ebay guides, has one maybe two Xerox branded Fluke 87s.
There is a service manual for the Fluke 87 series 1 that has schematics, bill of materials and calibration instructions.
Modemhead also has some extensive blog entries on fixing common problems with the original Fluke 87 series like fading digits, blown fusible resistor, dirty rotary switch contacts, etc. See
mrmodemhead.com