If you push on the suspect woofer do you hear a scratching sound? If so, then the voice coil is bad. Happened to me with a pair of Paradigms after my son used them.
As for repair, you should be able to get a replacement driver from Audio Physic. Prepare yourself for the cost and good luck.
As for repair, you should be able to get a replacement driver from Audio Physic. Prepare yourself for the cost and good luck.