FERC (i) sets aside the determination in the Remand Order that interested parties may review Mystic’s revenues and challenge Revenue Credits during the true-up process; (2) grants Mystic’s Motion to Lodge the Audit Controls Report posted by ISO-NE on its website;  (3) denies Public Systems’ Audit Information Request; and (4) accepts ISO-NE’s proposed modifications to its audit procedures in response to Audit Information Request and (5) encourages ISO-NE to implement those modifications for the remainder of the term of the Mystic Agreement.