This contract covers annual preventative maintenance and as-needed repairs for NAMRU-SA's in-house LC-MS instrument system. The system includes an AB Sciex API 4000 triple quadrupole mass spectrometer, a Shimadzu Prominence UFLC high performance liquid chromatography system, an onsite nitrogen generator, and a rough pump. The equipment supports characterization, identification, and quantification of chemical and biological molecules in liquid samples for pharmaceutical, blood product verification, multi-omic, and material identification projects. No budget, performance location, or timeline details are provided.