9:45 AM ET 02/03/12 - MBS prices are down -11/32 (FNMA 30-yr 3.5 at 103.23), which is about 11/32 lower than yesterday at this time. Favorable repricing was seen yesterday. The 30-yr fixed FNMA required net yield (60 day) is now at 3.36%, from 3.37% yesterday, but it does not reflect today's losses....