You cannot really replace Grover Rotomatic 102 with Gotoh SE700! First TMG does not like to add the second mounting screw hole to the headstock and second the main post holes in the headstock have a diameter of .39" (9.9mm) and SE700s require only 7.5mm/8.8mm holes! Hence my proposal in post #2, which is however irrelevant here as no second screw is requested by TMG.I believe the factory is using Gotoh SE700 Open-Gear in Gold.
I still have a 2007 D55 where I replaced all the Grover tuners with brand new ones that I ordered from an online guitar parts supply. The new ones fit right into all the openings on the guitar headstock. They are authentic and I don't mind at all how they look on the guitar. When I got bought this guitar in 2011 it was "as new", except it had possibly sat somewhere in humid Michigan, and there were small rust specs forming under the gold.
Before you go spending a lot of time and money, try this... Take the string off off the offending tuner and on the front of the headstock, where the tuner post comes through, is a nut. Make sure that nut isn’t over-torqued. Loosen it and retighten to finger tight, and just a slight tad more with the wrench. There was one that was way too tight on one of my jumbos, and that was the issue.
I took the tuner off and applied a lot of penetrating lube to it.
Then I worked it back and forth a lot. I found a tight spot and got it worked.
Changed the G tuner with the E tuner.
They all feel good now.
There was something inside the G tuner that was sticking.
It is now turning smooth again after the lube and cranking.
Thanks for all your help.
I doubt that I will now need to replace the tuners.