I've never needed to replace them, as mine work fine and nobody has ever asked me to do it while performing other repairs, but I can look at it on yours to note the process if you want. Perhaps I could also go ahead and make that video on the disassembly/reassembly of the grilles that I've been meaning to do, as well. Actually I have a lot of AKG service videos I've been wanting to make, dunno when I'm ever gonna get around to it.
I'm hoping to finally get your K1000 done this weekend. We hardly had anything going on at work before, but now all of a sudden lately it's gotten crazy busy.