Replace parts on pump?

Elizabeth
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Have any of you replaced parts on your pump because it wasn't getting enough milk out? My baby is almost 10 months and I feel like I don't get as much milk as I used to. Also, I just went 6 hours without nursing or pumping.. I pumped first, only got 3 ounces from both sides together, and now I'm nursing my baby right after I pumped and he seems to have no problem getting milk! Is my pump defective? Have you had to replace your parts or get a new pump? I don't even know what to replace!

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