he is very correct, do not heat it up. I'd like to see a photo of it. I cant understand that much damage unless a tree fell on it. My bet would be a 2 lbs hammer and just taking your time.
'Life should NOT be a journey to the grave with the intention of arriving safely in an attractive and well preserved body, but rather to skid in sideways - body thoroughly used up, totally worn out and screaming 'WOO HOO, What a Ride'