3. Explanation of Columns in Section III.a. ReferenceCode. This column consists of two letters separatedby a dash, both of which are references to Section II.The firstletter references column 5 and the second letter references a mainte-nance function,column 3, A through K.b.Remarks. This column lists information pertinent to the mainte-nance function being performed, as indicated on the MAC Section II.213 0 7 - 9 6 7 O - 6 8 -4
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