This is a sole-source, firm fixed-price contract for on-site preventive maintenance on specific horizontal boring mills, intended for award to a named OEM. The planned period of performance is from April 27, 2026, to April 26, 2031, consisting of a one-year base period, four one-year options, and a six-month extension. The work is to be performed on-site. This is not a request for competitive proposals, but other responsible sources may submit a capability statement for consideration by the specified closing date.