Do these rules apply to me if I had multiple errors?
Primary source
Verbatim text below is from the Electronic Code of Federal Regulations (eCFR), a public-domain U.S. government work. Always verify the current version with the eCFR before relying on it for any legal matter.
Full Text
You must be in the wrong retirement plan for at least 3 years of Federal service after December 31, 1986. You need not be in the same wrong retirement plan during the entire 3-year period. If you had more than one type of erroneous retirement coverage, then you will have a retirement plan election under these rules if one of the errors is of a type that qualifies you for an election.
This is legal information, not legal advice. Laws vary by jurisdiction and change frequently. Always verify current law with official sources and consult a licensed attorney in your jurisdiction for advice on your specific situation.