(2)
If the investigation initiated under section
2412 of this title involves a trade agreement and a mutually acceptable resolution is not reached before the earlier of—
(A)
the close of the consultation period, if any, specified in the trade agreement, or
(B)
the 150th day after the day on which consultation was commenced,
the Trade Representative shall promptly request proceedings on the matter under the formal dispute settlement procedures provided under such agreement.