This is a combined pre-solicitation and solicitation for the sole-source repair of a specific radio amplifier for Foreign Military Sales to Spain, with Stellant Systems, Inc. identified as the only known approved source. While the procurement is intended for this prime contractor, all responsible sources may submit capability statements, proposals, or quotations for consideration. Interested parties who are not the approved source must submit specific company and technical data, including a source approval request, with their proposal to be eligible. The Government will consider all proposals received within 45 days of the synopsis publication. For performance of services, the location is not specified.