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Re:Heartbreaking: 6509 PSUs Fail After a Brief 22 Years of S... by exikyut on Monday January 31, 2022 @09:02AM (#30147941)
This is very interesting insight, and being able to absorb cohesive info as an interested but unfamiliar outsider is appreciated.

I had a bit of a cursory google and probably quite predictably didn't find much beyond cisco issue reports - is there any speculation out there about the actual root cause of the hardware faults you refer to?

Re:Heartbreaking: 6509 PSUs Fail After a Brief 22 Years of S... by kloch on Monday January 31, 2022 @09:51PM (#30158045)
Here's the field notice: https://www.cisco.com/c/en/us/support/docs/field-notices/637...

and more general discussion: https://www.cisco.com/c/en/us/support/web/memory-component.h...

The field notice only applies to cards but the power supplies were definitely prone to permanent failure on power on, possibly from a different type of failure. I replaced more dead power supplies (that had died on power up/cycle) than line cards over the years that I used them.