Do you have a centerstand? You could grab the rear wheel while it's off the ground to see if it has lateral play. Also check wheel bearings front and rear, and the steering head bearing. Get the front wheel in the air (may take a helper) and move the handlebars back and forth. Feel for a detente in the middle. Push and pull on front wheel to see if there's back-and-forth movement. Either could mean loose or damaged bearing.
The service limit for the stock front fork springs is 435mm. There are some bushings inside that are made of a softer metal and could wear out, but mine have been in for ages and I don't notice anything weird. My personal approach to the seals is that if they're not leaking, I leave them alone. I wipe the inside tubes down with a damp rag after riding through rain or bugs. 78k miles on the current build, 24k on the previous.
My bike got a new rear shock at 135k. It made a noticeable difference in comfort. One linkage needle bearing was dry as a bone, and the galled up needles fell right out. It would be a good idea to lube them proactively every once in a while. If you have a centerstand, it's an easy job.