Attached to this post are PDF's of the service manuals for some of the NuBus-based Power Macintosh. Enjoy :)
powermac_6100_series.pdf - Power Macintosh 6100/60, 6100/60AV, 6100/66, 6100/66AV, 6100/DOS Compatible, and Workgroup Server 6150
powermac_7100_series.pdf - Power Macintosh 7100/66, 7100/66AV, 7100/80, 7100/80AV
powermac_8100.ws_8150.pdf - Power Macintosh 8100/80 and 8100/80AV, Power Macintosh 8100/100 and 8100/100AV, Power Macintosh 8100/110, Workgroup Server 8150, Workgroup Server 8150/110