The Department of Defense, specifically the Department of the Navy through NAVSUP Weapon Systems Support, is seeking proposals for the repair and modification of the Analog Input PWA, with a requirement for 21 units of NSN 7R-5998-015773459-H1. This procurement necessitates engineering source approval due to the flight-critical nature of the item, which requires that only approved sources with unique design capabilities and manufacturing knowledge may participate. Interested parties must submit their proposals along with the necessary source approval documentation within 45 days of this presolicitation notice, and any proposals lacking the required information will not be considered. For further inquiries, interested vendors can contact Dina M. Wojciechowski at (215) 697-1219 or via email at DINA.M.WOJCIECHOWSKI.CIV@US.NAVY.MIL.