Corrigendum- I to 400kV Transformer Package TR-18T for 2 x 500MVA, 400/220/33kV, 3-Ph Autotransformers at Ishanagar associated with Western Region Expansion Scheme XXXIII (WRES - XXXIII): Part C through Tariff Based Competitive Bidding (TBCB) route prior to RfP bid submission by POWERGRID to BPC (投標 №92986145cn)