Unless there is some other damage to the playfield, I would just try removing the glue left behind by the mylar and keep the original playfield. I am getting ready to remove some mylar glue from one of my games using 91% or higher isopropyl alcohol, some flour and a plastic razor blade. This will be much less work than replacing the playfield, and it will probably increase the value of the game because it will have the original playfield and it will play faster without the mylar.