screen door was hooked into a chain but a gust of wind storm broke the chain, and now the screen door only closes 3/4 of the way. Before the door would close slowly after an initial rapid close. I assuming that after the chain broke the wind damaged something. I am thinking something is wrong with the pistons that regulate the closing of the door. I am new homeowner, and I have been lucky that I have been able to fix most things that have gone wrong, but here I do not know where to begin

Thanks for your help