Here's the tools used to re-fold the flanges. (don't mind the hammer marks)
A mark was used on the front to indicate the new fold line. This press brake die was placed against the back side, and the flange tapped over. A flush tap against the face every now and then keeps the folded edge crisp..
That took the flange over about 90 degrees, then this modified gooseneck die was used to take it over to about 135 degrees...
At this point the gate was closed to verify gaps. A door skin hammer on the inside and a dolly against the outside skin was used to complete the fold..