Recently I rebuilt my Warn 9.5XP winch, and replaced the old steel line with Warn's Spydura 3/8"x100' synthetic line. I had my brother give me a hand with all this, and he shot some video of the process and uploaded it to his YouTube channel.
The whole process was pretty straight forward; we just disassembled the winch, cleaned off all the old grease with brake cleaner and paint thinner, then re-packed it with new grease, put on new gaskets, and put it back together.
Along with the new synthetic winch line, I decided to replace the rollers on the fairlead with Daystar rollers, rather than use a hawse fairlead.
Check out the video for the whole process, it was pretty interesting actually seeing how the planetary gears work.
EDIT: I got everything from Amazon.com by the way; the new line, rollers, warn gaskets, and even one of the bolts that I lost that holds the planetary housing on the winch. You can find all the part numbers from the Warn website.
VIDEO HERE:
http://www.youtube.com/watch?v=BADjA0t0g8I#t=91