Relocation of the Captain’s and First Officer’s Oxygen Mask Assemblies from the just forward and outboard of each pilot’s position in the P13 and P14 crew sidewall panels respectively, to adjacent to the aft edge of the P13 and P14 crew sidewall panels per Avionic Support Group (ASG) Master Data List (MDL) 210126-MDL, Revision C, dated December 23, 2010, or later Atlanta ACO approved revision.