This requirement seeks preventive maintenance for an LC/MS/MS system to ensure reliable measurement of dehydroascorbic acid and vitamin C. The service plan covers a Waters XEVO TQS micro-LC/MS/MS system for a twelve-month period, including at least one scheduled Performance Maintenance visit. Maintenance and repairs will be performed by certified Waters Field Service Specialists using Waters Quality Parts and standardized protocols. The plan includes full-service coverage with standard response times for repair services, parts, and labor. No budget amount or performance location is specified in the description.