The National Institute of Standards and Technology (NIST) is issuing a Combined Sources Sought Notice and Notice of Intent to Sole Source for repair and upgrade services of its Quanta FEG 200 Scanning Electron Microscope (ESEM). NIST aims to restore and maintain the ESEM by procuring replacement parts, specifically an aperture mechanism and an FEG source, along with ongoing preventive maintenance services. The importance of this procurement lies in ensuring the operational efficiency of critical laboratory equipment used in semiconductor machinery manufacturing. Interested parties are encouraged to submit their company details and capabilities by January 30, 2025, to assist NIST in determining the appropriate solicitation approach; however, this notice does not guarantee a contract award, and NIST will not cover any costs incurred by respondents. For further inquiries, contact Forest Crumpler at forest.crumpler@nist.gov.