I like my S-Tracks but they're on their last legs after not particularly long and there doesn't seem to be any way to take them apart enough to service them.
You can swap spindles with relative ease and IIRC the bearings are pressed on to the spindle (been a while since I did it) - I’ve swapped bodies and spindles between various pedal sets to get a perfect pair - you can also use the spindles from other Look pedals.
I like my S-Tracks but they're on their last legs after not particularly long and there doesn't seem to be any way to take them apart enough to service them.