• After Eaton engineers completed UPS shutdown maintenance and building power was restored, Eaton engineers restarted site UPS and found UPS A1 was failure and alarmed. Then, Eaton engineer coordinated source to have the UPS A1 main control panel replaced. For MS UPS have been running for almost ten years, during replacement period, Eaton engineers have to downgrade the exist control panel spare parts to match site UPS host. Therefore, it is necessary for service provider to prepare critical spare parts which can meet the requirements of site in advance.