Lenovo Onsite Upgrade - Extended service agreement - parts and labour (for system with 1 year on-site warranty) - 4 years (from original purchase date of the equipment) - on-site - response time: NBD - for ThinkStation P310 30AS, 30AT, 30AU, 30AV; P410 30B2, 30B3; P520 30BE; P520c 30BX, 30BY