Yesterday my dad gave me my grandma's pressure cooker/canner. I even have the original manual with my grandma's note written inside that said my grandpa gave the canner to her for Christmas 1947 (that note squeezed my heart!). I know there is a place online to order parts, do you think I should just replace all parts to be safe? Isn't there someplace I'm supposed to take the canner to be checked? Is that a good brand of canner?