What should be done if one of the brass supply valves is leaking or shows signs of corrosion within the valve?

Over a period of years, the buffer valve, and possibly others, may begin to corrode the brass valve body. As of November 2022, the buffer valve in new instruments comes with a PEEK chemical-resistant valve body. However, older instruments may show signs of internal corrosion, pitting, and leaking buffer, pulling this reagent in, and not sealing internally as it once did. To change this component, follow the TDF Service Procedure Supply Valve Body & Piston Replacement (TS046).