jls wrote...

I'm speaking of the gyros as the vacuum system, and
you will note that the article implicates gyroscope obsolescence:

But the suit was against the vacuum pump manufacturer,
not the gyro manufacturer. The NTSB concluded that a single
attitude gyro failed, and that the vacuum system was functional.

Here, read for yourself:
"The NTSB accident report indicated there may indeed have been problems
with
the primary attitude display, but said that secondary instruments were
probably functioning at the time of the crash."

Right back atcha:
"...one of the vacuum gage system failure indicator buttons
exhibited evidence of having been in almost the fully retracted
position (the other indicator button was found in the partially
retracted position), which indicates that adequate vacuum existed
for the airplane's instruments to operate."

Dave 'forensic engineering' Hyde