Based on calculated values, a bearish divergence was observed between SPX vs Calculated ($SDxv, red line) on the 13SEP2012.
With the help of QE3, SPX touched a new high @1474.51 on the 14SEP2012.
Yesterday's action brought the RSIs from both charts below 50, with high probability of rolling down.
Next supports 1400 and 1360.
J.