Replacing cracked thermal pane glass?

Double hung Pella wood window approx 13 yrs old. Was installing a window ac and was screwing in a bracket on the side to hold the window down and you guessed it, the screw was too close to the glass and too long and CRACK goes the inside window pane. Trying to figure how to remove the whole glass insert to replace. The window tilts in and all I see on the outside is metal overlay over the sash. Does the entire sash have to be replaced or is there a way to take apart the sash.