I don't know if the 1981 issue is covered, but you can read some very fun examples of bugfixing and OTA updates on the Voyager spacecraft in this article:
Including a 20 year wait for a pro-active fix to pay off in prod!
"A CCS FSW patch was developed and implemented in 1995, and linked on the spacecraft in 2006 for V1 and 2005 for V2 to automatically restart some of the critical functions in the event of an Error entry. This patch was exercised in flight in 2014, nearly 20 years after it was installed, when one of the CCS processors went into an error entry on V1; the patch worked as designed."
I would love to read about specifically what went wrong in 1981.
The closest I could find was this old article from 1981: https://www.nytimes.com/1981/08/28/us/swivel-on-voyager-stil...
But there isn't nearly enough detail in it. Is there an analysis anywhere online of that event?