Thanks. To answer properly, probably a little more detail would help.
Last fall, I was noticing non-smooth motion from the mount (on the wedge). Especially noticeable when using PHD2 and guiding at long focal lengths. I was never sure if it was the onset of cold weather (lower temperatures), or a problem with the bearings. In any case, when I took the mount apart, I did find that the bearing raceway was "dirty", and what appeared to be some small specks of plastic that were embedded in the grease. Also, probably due to issues casting the metal base (the bottom piece), the bearing raceway had a few "ruts" with paint in them. When I cleaned them out, I could see that plastic balls running over those ruts would not be good, and they would eventually wear down. Also, the grease Celestron used seemed kind of "sticky" to me. I figured I'd try to address these problems.
After another internet research project to figure out how to do it and what to use, I selected the ball bearings, and type of grease. I ended up ordering the "Tight-Tolerance Hardened 440C Stainless Steel Ball, 1/4" Diameter, 3 Packs of 50" from McMasterCarr, and I used the SuperLube Multi-Purpose Synthetic Grease. There are many opinions out there about these choices, hope I made the right ones! And, I'm hoping the newly installed stainless steel balls will be able to roll over the ruts without an issue. Also, adjustment of the main nut that holds down the top of the base and thrust bearing was more of a pain than I bargained for. It took me many iterations after the bearing replacement to get the tightness "just right". Oh, and I cleaned and re-greased the worm gear and the az gear.
Anyway, it was an interesting winter time project. I've been able to use it a few times, and the mount operates much better; very smooth. Hard to tell yet whether I'm getting decent guiding performance, since the few times it's been clear this winter, it's mostly been windy. And, maybe the much colder temperatures have an effect as well.
In any case, I'm grateful to the many people who posted about their experiences on CN, all that info really helped.
Sorry for the long answer, hope that helps.