RTiA1 mid driver replacement?

Hi, I recently found one of my RTiA1 mid drivers having muffled sound. If I press slightly on the driver the sound returns but gone again once released. I'm assuming the mid driver got blown. Pulled the 5.25in driver out and saw the following number:RD3552-1 (could be RD3352-1, second number smudged). I cannot find either online anywhere. Closest I can locate is a 5.25in RD5552-1-E pull from a RTiA9. Unsure if compatible. Any ideas? Does Polk sell replacement parts for the lower end RTiA1? Thanks!

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