I've been involved in space instrumentation, and although most of the team were indeed seasoned to some extent, they were in general (and by old codger standards, ie like me) pretty youthful. And lived and died high reliability. No repair is possible once the blue touchpaper is lit.
The instrument I was Project Manager for (the Mercury Imaging X-Ray Spectrometer, MIXS) was one of ten instruments on board this (launched on October 20th)
https://www.esa.int/spaceinvideos/Vi..._launch_replay
Fast forward to about minute 34 to see the beast go. Or the short video of the launch
https://www.esa.int/spaceinvideos/Vi...olombo_liftoff
A bit off topic, and many orders of magnitude more expensive than domestic audio, but repair was designed out for sure, and tested out on the ground in a major programme.
Craig