To further help out, the requirements for grading NC's are nothing to do with ISO 9000(or as far as I can remember, the accreditation rules/requirements of ISO/IEC 17021 (or the 'old' Guide 62). It's the individual registrars' interpretation, whereas, the IATF lay down the specifics. Indeed, many ISO 9000 registrars don't use 'major' and 'minor'.
The practice of clearing a minor NC during the audit is generally frowned on, by most accredited registrars (not auditors), because in principle a finding should lead to corrective action, not correction (that's not my view, BTW)