GPT header checksum mismatch

Reply: Arthur Chance : "Re: GPT header checksum mismatch"
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From: Greg Balfour <greg.bal4_at_gmail.com>
Date: Tue, 29 Mar 2022 14:45:44 UTC

Running 12.3-RELEASE I had a UPS failure and my machine did a reboot
without properly shutting down.  Now when it boots I see this
message:

gptboot: backup GPT header checksum mismatch

Doing a "gpart show ada0" shows

34  976773101  ada0  GPT  (466G) [CORRUPT]

The machine still boots fine.  I don't have a prior dump of the
partition table saved.  How can I clean up these errors?