rti a9 crossover fried

Bought a pair of Polk Rti A9's about 3 years ago. Never had any issues until now. Noticed that listening to music, they sounded dead. While watching movies, they sounded great. Ran them 2 ch stereo and noticed that the tweeters were dead. Swapped in a dif tweeter from surrounds and still dead. Called crutchfield and, since they were still under warranty, they sent new crossovers. They actually wanted to send a new set of speakers!!!, but I was not ready to pack these monsters up to ship back. Long story short, this is what I found after removing x-overs. Obviously the white component, which is discolored and cracked is the problem. Can anybody tell me what this component is?


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