I actually placed a couple of anchors there about 12 months ago because my partner and I were training for Yosemite aid climbing. After extensive inspection I also put up a bolt ladder but only with small dynabolts simply for training purposes (doing bolt ladders as fast as possible). Unfortunately later on, for the first time, I noticed the faintest of markings at the base of the 'training crack' beside it.
My apologies if this has offended or defaced what might be a historical route. I didn't notice til afterwards.
I suggest not leading on the bolts, they are essentially only 'rivets'.