TM 1-4920-448-13&P10. Aline bolt holes (14) in base of ECU withholes (15) in shelves (2).11. Obtain ECU mounting hardware from shopstorage chest and install IAW TM 5-4120-384-14.NOTEProper fit between ECU and surrounding seal is essential to maintain light discipline.13. Check seal (16) around ECU (9) for proper fit and alinement. It ma y be necessary to temporarilyremove the ECU Security Screen (17) to properly aline ECU seal.