bids are invited for repair, maintenance, and installation of plant/ systems/equipments (version 2) - ins hansa; repair and maintenance of galley equipment; service provider, 1.1 repair and maintenance of 4 door stainless steel commercial refrigerator with change in relay, subzero and topping up of 404 refrigeration gas 1.2 repair and maintenance of commercial chapatti machine with change in motor rotatory rod and motor copper vending 1.3 repair and maintenance of gas pipeline with change in psi and nrv valves 1.4 repair and servicing of visi cooler with change in capacitor filter and toping up of r22 refrigeration gas