Looking for troubleshooting advice for an Electrolux Epic 8000 canister vacuum. Everything works except power brush. Issue is electrical, not mechanical.

Check the drive belt. could be broken. Not sure about reset button but i would say it has to do with the belt.

the link to a video below shows belt replacement as well as brush, press the helpful button
Changing the Brush Assembly on an Electrolux Epic 6500 Vacuum Cleaner

Try a different hose to test the motor. Make sure it's a good one from a working vacuum. If it works, the problem is likely in the switch, wiring, but could be the hose itself. Other problems could the the triac or relay in the vacuum.
Best thing to do is to take it in to an Aerus dealer and let them troubleshoot it if a different hose doesn't work.
Note: Do NOT use a Renaissance hose.

GO TO LINK BELOW
http://www.aerusvacuums.com/support/manuals/

The light with a cord "plug" on it indicates that there is power coming to the vacuum. This is normal.
Assuming that the vacuum works, but not the power nozzle, turn the PN over to view the brush. Clear all hair, thread, fibers, etc., that may be wrapped aroung the brush. Use a sharp knife or scissors to cut through them for ease of removal. Make sure the ends of the brush are cleared as well. Try the vacuum and press the reset switch on the PN. Does it work?
Is the PN motor running, but the brush isn't spinning. Turn PN over and try to spin the brush. If it turns freely, the belt is broken and needs replaced. This should be done by an authorized Aerus Electrolux service tech to avoid incorrect reassembly and resulting damage to vacuum and owner.
If the brush doesn't freely spin, but turns with resistance, this is normal.
If it still doesn't work, try the Sidekick mini power nozzle that should have come with it. If it works, but the full size PN doesn't, there's a problem with the PN. It needs to be taken to an authorized Aerus Electrolux store for diagnosis (free) and repair.
If the Sidekick doesn't work, the problem is in the hose, wands, or canister. It could be due to bad switches, wiring, and other electrical problems. In this case, the entire vacuum needs to be taken to an authorized Aerus Electrolux dealer for diagnosis and needed repairs.

http://www.aerushome.com/storelocator/

You can find those bags at

http://www.totalvac.com/850-12.html

Fits all Electrolux canisters/tanks made after 1954, (except Lux 9000, Guardian, Epic 8000, Renaissance, Harmony or Oxygen models) Generic 12 pack of Electrolux vacuum bags.

Does the power nozzle motor come on? Is it just that the brush won't turn? If it's just the brush not rotating, the belt probably broke and needs replaced.
Is the brush clean? If not, clean all threads, etc. off.
Check all wire connections for breaks, cracks, and discoloration. Power nozzle to wand, wand to wand, wand to hose. If any of those are found, that part, and probably the one it connects to. will need replaced.
Ensure all connections are snug.
Internal wiring, including connections, could be bad. This would include wiring in the power nozzle, wands, hose, or canister.
Reset or hose switch could be bad. These would need replaced.
Power nozzle motor could be bad. Generally the belt will break before the motor burns out, but it's possible it's didn't.
For any internal repairs, including belt replacement, the entire vacuum should be taken to an authorized Aerus Electrolux dealer. The service technician can also troubleshoot and find the problem. This is generally done at no charge.
You've got a great machine, and with proper care and maintenance it should last for years to come.

No. If the power nozzle motor is running, then a new belt will do the trick.

Try hitting the reset button,It is a small button on the top of the brush and make sure the switch is turned on on the handle.

The easiest solution would be to call your local Aerus/ Electrolux representative, because the corporation doesnt publish diagrams.