I took mine in for Oil Service 3 weeks ago and told them about the creaking. It was coming from the area shown in the pic. The applied some sort of lube to it(as a first attempt to remedy) before taking stuff apart and sliding Teflon tape between the parts. I was confident that it would not work or that it would be very short lived. It's been 3 weeks and still no creaking...no telling how long it will last. I'm not sure what kind of lube they used but had I tried to fix it myself I would have used TriFlow Dry lube
http://www.triflowlubricants.com/Dry_Lubricant/dry.html
Arrows indicate areas where I stuck paper between the plastic parts to temporarily curb the creaking.
