The Letter was written in April 2008 and a claim would need to be filed prior to the 3 year anniversary of said letter. There may be some latitude in the exact date being either the date of the latter, the date of receipt in Caracas or the date of receipt by the Board.

RedRock....this clarification (courtesy Brundoggie's DD) provides the answer to the riddle you discovered regarding the wording change with respect to the arbitration deadline between quarterly reports. Less sinister overtones taken in this context.