The Department of Defense, specifically the Department of the Navy through NAVSUP Weapon Systems Support, is seeking proposals for the repair and modification of discrete input PWA, identified by NSN 7R-6110-015773457-H1, with a quantity of 29 units required. This procurement necessitates engineering source approval due to the flight-critical nature of the item, which mandates that only approved sources can provide the required parts to ensure quality and compliance with government standards. Interested vendors must submit detailed proposals, including necessary documentation for source approval, within 45 days of this presolicitation notice, with the primary contact for inquiries being Dina M. Wojciechowski at (215) 697-1219 or via email at DINA.M.WOJCIECHOWSKI.CIV@US.NAVY.MIL.