Hey Scotty, my car has a transmission problem. When the engine is cold, the car doesn't like to…

Hey Scotty, my car has a transmission problem. When the engine is cold, the car doesn't like to change from second to third gear. Once it warms up though, and it shifts like a dream. I know that the transmission is leaking somewhere, because the transmission always works perfectly normal whenever I top the fluid up to full, for about a week. So, what would you think the problem would be?

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