bids are invited for repair, maintenance, and installation of plant/ systems/equipments (version 2) - bsnl telephone exchanges at kandi, ramay et, chegunta, papannapet and narsingi in medak ba; various capacities of avrs; as per atc - attending break down call for all capacity air/ oil cooled servo controlled automatic voltage stabilizer including rewiring of all control wiring .replacement of minor spare ports like transisters, ics, control relays, resisters etc. wherever required except the for the major spare parts mentioned in item no: 2 and cleaning the avr by blower, removing the dust and other particles, complete etc.. as required , supplying and fixing of following spares in replacement of faulty components in the existing 5 kva/ 15 kva/ 30 kva/ 45 kva servo stabilizers including replacing of following faulty spares /components etc. as required , providing topping up of transformer oil in oil cooled avr up to the required level etc. as required , lifting of variac assembly core from oil tank with the help of tripod/ labour for servicing and keeping as it is after servicing