Many have wanted to fix a warped CI pan, and many have asked if it's possible. If any have actually tried, they've either ended up with a broken pan or the same warped pan they started with. Neither physical impact nor pressing force will work, nor will trying to recreate a situation similar to what caused the warp in an attempt to reverse it. Temperature high enough to make the iron malleable again would deform the entire piece, and would also be beyond the temp at which that which we call fire damage occurs.