Good day, I just did that this week-end with my G11. It is a 2000 model so yours might be a bit different. Strip everything then clean all the worms, gears, bearings with mineral turpentine and a brush in a large plastic tub to get rid of all the old grease. The bearings inside the RA and DEC housing you can just brush them until they get loose then keep rinsing them to get rid of all the gunk. Then let the whole thing dry. The day after grease all the bearings and the gears with a molypaste or equivalent (MP50 does the job). Be careful this grease is very messy. Whatever it touches is "wet". It will stick very well. That's the point anyway. Then you put everything back together and set the worm meshing then check the tension manually over the whole circumference back then forth. I usually do a service on the mount every 12 months. Once you've done it that many times it's just muscle memory.
