Sorry, I think I got (and subsequently shared) some incorrect information!
We actually don't want to change the indicator in the 830 field, we just need to remove the field entirely! So, reworking what I sent originally - Out of the 490s and the 830s that we're working with:
=490 1\$aCRS report ;$vR44999.
=490 0\$aHeinOnline U.S. Congressional documents.
=830 \0$aCRS report for Congress ;$vR44999.
=830 \0$aU.S. Congressional documents.
We simply need to remove that corresponding 830 field entirely.
=490 1\$aCRS report ;$vR44999.
=490 0\$aHeinOnline U.S. Congressional documents.
=830 \0$aCRS report for Congress ;$vR44999.
I suppose the trouble there is then simply making sure that we have identified the proper 830 field before removing it. Sorry for the confusion!
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