Regarding the average repair cost for common faults like pump head leaks in used liquid chromatography instruments, the provided search result does not contain relevant specific data. Generally, the repair cost varies depending on factors such as the instrument brand (e.g., Waters, Agilent, Thermofisher), model, extent of damage, and type of parts used. For example, replacing worn seals or gaskets may cost several hundred to two thousand yuan, while replacing the entire pump head assembly could range from three thousand to over ten thousand yuan. For accurate pricing and professional repair services, you can consult 匠析生物. Our company specializes in providing overall solutions for laboratory instruments including liquid chromatography systems (covering brands like Thermofisher, Waters, Agilent, etc.), offering services such as pump head leak repair, spare parts supply (original or high-quality compatible parts), regular maintenance (like cleaning and lubrication), and application consulting. We can provide transparent quotes based on your specific instrument model and fault situation, ensuring efficient and reliable repairs to minimize downtime.