Jon replaced the bearings in ours yesterday
…so now go and stick the washing on…! 😉
If you got somebody in to do it, it probably would be economically unviable – took me maybe 3 hours to work out how to get it to bits, then maybe another 2 hours cleaning it up (7 years of shitty bike kit, london water and then grease from the bearings), plus 3 hours to get the bearings in and reassemble. So for a pro, still a mornings work (say 3 -4 hours) = easily £100+. About £17 in parts though.
If you’re mechanically handy, well worth a punt. Changing the bearings is no harder than doing a hope hub, they’re just bigger. I cut a couple of discs of 18mm ply to the same size as the bearings, then (having chilled the bearings in the freezer and heated the housing with a heat gun) used my headset press to wind them in. Worked pretty easily.