My first question would be why do you need to replace the damper? We've found that they're pretty stable unless the damper fill arm gets messed up. There isn't a filter screen in it so it shouldn't clog up. But if you need to, service mode isn't necessary. And this is at your own risk. The biggest (not the only) liability would be getting ink where it doesn't belong.
Just remove the ink line(s) on top of the damper - be ready with a rag or paper towel to catch any drips - and use a syringe to pull the ink out of the head and damper. The damper is held on with a clip in front and a similar clip in back. Pop these clips off and the damper is free. Make sure that the top of the print head is clean (lint free cloth or cleaning swab works here) and replace the damper by pressing down firmly till both clips catch.
Then run a couple of damper fill routines and you should be good to go.
Good luck