Magnepan MMGs Crackle Sound

I was listening to an album I had never heard before and I noticed a crackling sound coming out of the speakers.  I confirmed it wasn't actually part of the recording by listening thru headphones.  What I don't understand is I don't hear it on anything else I listen to.  Since I'm not the original owner of the speakers, I contacted Magnepan to get the build date, which was June 2008.  Seems like they aren't old enough to go bad after 13 years.  I've had them for about 2 months. I don't drive them particularly hard.  Max volume in my room is around 88 db.  Anything over that is too loud for my ears.  My question is how can I troubleshoot the issue to confirm they need to be fixed.  I don't want to ship to Magnepan unless absolutely necessary. I know it's not a component issue because I hear the same thing in my office system when listening to the offending album.