This is a non-personal service(s) contract to provide preventive maintenance and repair services for Pickering Equipment used at the Defense Centers for Public Health (DCPH) to support the mission of ... This is a non-personal service(s) contract to provide preventive maintenance and repair services for Pickering Equipment used at the Defense Centers for Public Health (DCPH) to support the mission of DCPH - Aberdeen (DCPH-A) Liquid Chromatography Lab Branch. The Onyx PCX instruments are highly complex optimized High Performance Liquid Chromatograph (HPLC) post column derivatization systems for the analysis of various environmental and biological analysis (e.g. Carbamates, toxins and more).