The FDA seeks a contractor to provide post-warranty preventive maintenance and repair services for a specific BD LSRFortessa X-20 flow cytometer system located at the White Oak Campus in Silver Spring, Maryland. The requirement is for one base year from April 2026 to April 2027, with two one-year option periods. The contractor must provide two scheduled on-site maintenance visits per year and unlimited on-site repairs within two business days, using OEM-certified parts and technicians. This is a market research notice to identify capable small business and other sources, and it is not a formal solicitation.