Freddie Mac has offered to repurchase mortgage PCs backed by a number of mortgages that may have been originated with unacceptable refinancing terms and that are currently showing faster prepayment rates. Officials at the Virginia-based government-sponsored enterprise made the buyback offer after informing PC holders that 49 mortgage pools with a combined outstanding balance of $178 million may have been tainted by mortgages that are prepaying faster than comparable Freddie PCs. The specified pools