The notice announces a sole-source contract for maintenance of an Illumina NextSeq 2000 instrument. The one-year performance period runs from September 22, 2026 through September 21, 2027. Services will be performed for the NIH Clinical Center. Illumina is identified as the only source for preventive maintenance, replacement parts, and engineer expertise. No solicitation will be issued, though interested parties may submit comments regarding the sole-source action.