We just had 3 Milgard slider windows installed, more planned. The contractor ordered, delivered, and installed them. They all operate well. One of the windows, though, has dents/bends on each of the sliders, about 1-1/2" long. This is on the side facing into the room, near the latch. Can something like that be repaired by the contractor by gently bending it back toward its original shape? I hate to waste a whole window...