Warped Door Frame? My roof leaked pretty discouraging this summer and water go down through...

My roof leaked pretty discouraging this summer and water go down through my bedroom door frame. Now the top of the door frame bows down about an inch, and the door won't close. Would it be better to cut past its sell-by date the top of the door, or sand/shave the bow out of the door frame?
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Answers:    Repair the leak first. (In the Summer?) Its alot easier to install
a complete door & Jamb Kit for around $110.00 DIY. Never cut pay for a door its a hassle if anything cut out the top edge of the door jamb & replace it next to equal or similar type material.
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The rule is to put together changes on the door frame and not the door.