wéi / xiū / rén / yuán / qīng / lǐ / le / jiù / de / sàn / rè / gāo / rán / hòu / huàn / shàng / xīn / de维修人员清理了旧的散热膏,然后换上新的。The technician cleaned off the old thermal grease and then applied new grease.