On Friday, the benchmark indices were trading in the red with the Sensex down around 48 points or 0.07% at 71,388 while the Nifty-50 down around 40 points or 0.16% at 21,682. About 936 shares have advanced, 2,677 declined and 137 are unchanged on the BSE. Top gainers and losers on the BSE Sensex index …