Power Option # Manufacturing Part # Description Previous Part # X7407A [S] 300-1568 23 24 [C] Type A178 400 Watt AC Input Power Supply n/a X7428A [S] 300-1674 [C] Type A192 400 Watt AC Input Power Supply n/a X7428A-4 [S] 300-1846 [C] Type A192 400 Watt AC Input Power Supply, L n/a n/a 370-5138 [F] DC Power Distribution Board n/a