Just got email from customer . She said that they noticed a couple of small holes in a window ( Dads Place we cut for son and daughter dads very old ) She said they were not there previously . She asks if lawn mower or blower could have caused damage. There is some rocks in a bed (large 1-1/2" ) near back of house 3-4 feet from house , no rocks on lawn . We have been cutting this place all season never had rocks fly from mower or trimmer , my blower hand held not much power to blow rocks up four to five feet off ground to break a window. Did not notice anything flying around , normally if you hit rocks you hear them . What should I do ??? she is not saying we broke window or asking for a replacement . If I threw up some rocks I think they would go right through ??? Any suggestions !!!!