Case C-646/11 P: Judgment of the Court (Eighth Chamber) of 24 January 2013 — Falles Fagligt Forbund (3F), formerly Specialarbejderforbundet i Danmark (SID) v European Commission, Kingdom of Denmark (Appeal — State aid — Tax-reduction measures — Seafarers working on board vessels registered in the Danish International Register — Article 88(3) EC — Preliminary examination stage — Commission decision not to raise objections — Action for annulment — Conditions for initiating the formal investigation procedure — Existence of doubts regarding the compatibility of the aid with the common market — Period for the examination)