This is a sole-source RFQ for repair services for the Joint Service Mask Leakage Tester (JSMLT) for the Air Force Life Cycle Management Center at Robins AFB, GA. The repair work includes tear-down, evaluation, repair/replacement of failed components, cleaning, calibration, software updates, and engineering services. The contract is a firm-fixed-price, requirements-type IDIQ with a one-year base period and four one-year options, with performance beginning on or around November 18, 2026. The sole-source justification is based on the OEM, Air Techniques International, holding proprietary data rights, and W.S. Darley & Co. being identified as the only responsible prime contractor. Interested sources may submit a capability statement or proposal to the contacts listed, but no hard copies of solicitation documents will be provided.