I think the blob mentioned a few threads ago, is the same thing that happened to mine, and it progressively got worse over a few a weeks. I ended up sending it in under the guise of needs BIOS update, as well us typing up my own 'within 2 years' invoice for warranty servicing. It was an ebay buy so I didn't have the official invoice.
I ended up getting a new lens assy, hardware adjustments, and the bios update. I was able to talk to tech, and he said it was a burnt polarizer as well as panel damage. My new len assy is also black, like the hs-51a.
There are only 2 things I can attribute it to, since both occured around the same time, using the near 100 contrast settings + the record heat in California. I'm guessing the combination of both just burnt it out.
I did orginally think it was a blob, so I took the liberty of opening up my proj, and used compressed air and optical swabs to give the panels and polarizers a good cleaning. It did nothing.
Btw DJOS, just curious how can it be out of warranty? It's a limited 2yr, you should still have a good 2 months on it, if you were an early adopter.