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Gallien-Krueger 115T cab rattle

Hi, I bought an old GK 115T to use with a 400RB. It all sounds great until I hit certain notes on the E string (especially the 12th, 13th, 1st fret and open E) where the speaker rattles/farts pretty loud. The speaker looks ok from the outside. Anyone have any ideas what it could be and how to solve it? Also, how to open the cab? There aren't any screws anywhere. Here some pics. Thanks!
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Oh shoot, just noticed your post is from 2001. I'm about to buy a 115T myself. Not sure exactly how it was constructed, as I don't have it yet. Unless it's fastened from the front with screws into the baffle-plate, the grille is probably a squeeze-fit into narrow saw-kerfs on left & right and would have to be prised out from one side, then lifted clear.

The driver is front-loaded, so then you'd unbolt it to remove & inspect. Hopefully it's not damaged, because reconing an original EV 15L or B has become problematic.