Here are a few sites for general repair, rebuild, parts, diagrams, testing of most of the popular winches:
http://www.yotatech.com/f31/winch-re...writeup-12513/
http://www.fourwheeler.com/techartic...inch_breakdown
In Cab Winch Control:
http://www.4x4wire.com/jeep/tech/winch/hardware
Rebuilding a Warn 5000: (applies to most Warn winches)
http://www.members.show.ca/macks4runner/winch.htm
Rebuilding a Warn 8274:
http://www.pirate4x4.com/tech/billavista/8274/
Rebuilding a Warn 9000:
http://www.jonfund.com/technical/winchteardown.shtml
XD9000iWarn Winch Install:
http://www.stu-offroad.com/recovery/winch/warn-1.htm
Winch Problems:
http://www.yotatech.com/f31/warn-winch-problems-291121
Winch Troubleshooting Guide:
http://www.offroaders.com/tech/winch...leshooting.htm
Winching Tips and Recovery Advice
http://www.4wheeldrive.about.com/od/...ng/index_r.htm
http://www.jeepforum.com/forum/showthread.php?t=488547