Operation And Maintenance Of Switchyard, Operation And Maintenance Of Substation, Operation & Maintenance Of Data Centre Assets, Operation And Maintenance Of Lifts Elevators, Operation And Maintenance Of Water Supply Systems, Operation And Maintenance Of Electro-Mechanical Installations, Operation And Maintenance Of Gas Compressor Station, Operation And Maintenance Of Fire Fighting System, Operation And Maintenance Of Fire Alarm System, Operation And Maintenance Of Other Machines And Plants