I don’t know, but I’ll imagine that there are dual redundancies where possible and feasible.
I don’t envision too many moving parts. Nozzles, Jet blasts, perhaps solenoid or two. 18 years ago is 1999. Pretty viable technology.
Things wear and tear and the vacuum is harsh.
Killer satellites were talked about during Reagan’s SDI push. Haven’t heard much about them in years.
I don’t claim or believe that this was hit by a killer satellite, but it does remind me that the next war is probably going to start with or include destroying satellites.
Geosynchronous orbit is going to need some garbage collector bots.