1. it is best to replace the top-corner rubber seal before a year have passed, as a prevention measure to retain moisture and pressure (contact their official line or site, to verify this is the right part for your model):
http://cuckoomallusa.com/index.php/shop/accessories/cover-pack/ccp-10.html
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2. if however you have used it extensively, and cooked more than rice in it : the metallic cover itself may have deformed (difficult to be verified visually by looking at it) in which case the whole top replacement will be considerable that it would be more efficient to buy a new one .
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from your inquiry that it won't pressure-cook any more and it is getting messy : I would deduct it would be the latter case above .
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