The National Eye Institute (NEI) intends to award a sole source, fixed-price one-year maintenance agreement to Carl Zeiss Microscope, LLC for seven complex Zeiss instruments critical to its research. The required services include one annual preventative maintenance inspection, all labor and travel for service visits, covered replacement parts, and software version upgrades. Performance of services will occur at the NEI facility, with service available Monday through Friday from 8:00 AM to 5:00 PM. No specific budget amount is provided in the description. This is not a request for competitive proposals, and only offers with documented authorization from the original equipment manufacturer will be considered.