bids are invited for repair and overhauling service - online ups 10 kva for critical infrastructures-is:13947, is:9000; l1669 insulation failure is observed in the main incomer cable of pdb 21 located at engineering workshop to ensure safe and reliable power supply the.. , repair and overhauling service - online ups 10 kva for critical infrastructures-is:13947, is:9000; l 1670 external ringer of auto telephone system not working in following six positions; yes; buyer premises , repair and overhauling service - online ups 10 kva for critical infrastructures-is:13947, is:9000; l 1671 abnormal noise and vibration observed on stbd boat davit motor capacity 37 kw qty 01 no the defect on electric motor are to be rectified to ens..