UPS damage on a PC-Ultra and the protective grill has a good ding/crush to the ring across an approx. 1” location. If we keep the sub after demo, it might be that grill cover could be replaced without the need for shipping entire unit back/forth to manuf. But I need to see under the ring to see what crush damage there is (to what I assume is a raised ridge) on top edge of sub itself. Since it will not budge for me: trying to rotate or lift, (but I know it should normally) Is the grill screw on or pop off? This will factor into trying to work it off. I checked SVS website and could not tell regarding grill removal. I’m assuming it’s a simple lift off since the owners manual does not mention ‘screwing off’ the grill, in the port tuning section. But should be sure before my husband gets home and attempts any gentle forcing to get it off. Anyone know? Thanks so much M.