Comment by recursivecaveat

Apparently it uses ~2.7% of its fuel every year to station-keep in the right semi-stable orbit, so presumably you need at least some crew to manage that. (and any time it's not taking observations you never get back!) I know the voyagers have needed adjustments and reconfigutation from ground crews as equipment as decayed over the years, so I assume similar things would happen on a semi-mothballed JWST.