Yesterday I noticed a rattling noise coming from my 25-31PCi. I looked down the port and noticed what appeared to be paper-like material that separated from the inside of the port. When the bass would kick in, I would hear the sound of paper rattling. Is there any way to remove the grill from the sub in order to remove this loose material? Should it even be removed? Basically, is this a problem that I can fix, or should I ship it back to SVS since the warranty is still valid? Regards, - S.D.