This is a notice of intent to award a sole-source contract to Carl Zeiss Microscopy, LLC for maintenance and repair of a specific Zeiss LSM 880 confocal microscope system at the National Institute on Aging. The period of performance is from June 23, 2026, to June 22, 2027. The contract value is anticipated to exceed the Simplified Acquisition Threshold but not exceed $7 million. The justification is that the proprietary equipment can only be properly serviced by its manufacturer. While this is a non-competitive notice, interested parties may submit a capability statement to challenge the sole-source determination.