Lots of new routes are going up on the formation. In a back issue of Rock and Ice (or was it Climbing) from last year or the year before had some info.
Given that the last time I was in Peru, I talked with a couple different groups who had just put up routes that month (one at low .13, one at mid .12, one at A3) any information you get will be really outdated.
Best info is out of the new route book at the Casa de Guidos about 1 block off the city center in Huarez. Most of the topo's are straight from those that did the first ascents