This is a Sources Sought notice for market research, not a solicitation, to identify potential sources for Phase II Resolution of the AN/APG-68(V)9 Radar DMSMS program for the F-16. The work involves redesigning nine specific Shop Replaceable Units (SRUs) within the Modular Receiver/Exciter and Common Radar Processor to replace obsolete components while maintaining form, fit, and function. The contractor must fabricate two engineering development units per SRU, conduct bench-level qualification testing, and deliver a Phase III proposal. Performance is for Hill AFB, Utah, and the contractor will retain prototype units at their facility. No budget or submission timeline is specified, but the effort requires access to proprietary technical data held by Northrop Grumman Corporation.