A way to delete all "extra" fields? --related to error code

I am getting a recurring error related to the "extra" field. I cannot find the problem entry. I don't need any info. in any of the "extra" fields. Can I batch delete all of them? The error code is keeping me from syncing my data and holding up my work.

'Extra' field value 'Access: http://www.loc.gov/catdir/bios/ucal051/910...' too long
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