MBS CLOSE: As we tick across the close, we descend from a brave expedition...

Using yesterday's closing prices as a baseline, we've climbed a lofty mountain up to 2003's highs and have come a good portion of the way back down.  Just a little foray for those mountainclimbers among MBS traders.  Word from the mountain is they're still looking for a good place to set up base camp for future attacks on the summit.