So I sent my K1000 to Fitz a little while back for a re-cable. Today upon removing the wire mesh grills Fitz discovered someone's handiwork...
Nice huh?
The person I bought them from mentioned that they had new drivers installed, but forgot to mention the custom port in the side of one driver! He also never mentioned they were installed by anyone other than AKG. I've looked back through PMs here and there to discover who the seller was, but sadly can't find the PMs. I also can't find the sale ad. I do remember he was a young kid from England, and it would have been around November of 2008 when I purchased them. Not that I'd get any satisfaction monetarily, but at least I could warn others here about that member.
Fitz mentioned that it looks like a phillips bit may have caused the hole, and indeed it does look as though that may be the case.
Two goods things though...
1) I never heard any anomilies due to the hole.
2) I sent them to Fitz!
He already has some ideas as how to best repair them, and that guy is Dr. AKG for sure!
So it's a bit disheartening to discover this, but I'm very greatful Fitz is on the case. I'll keep you updated.