Thank you TheGrumpyOldMan for the pictures. I guess it is now safe to say this is something "official".
I will send my pictures to Yulong and I think we should all do the same. This way they would feel our "pressure" and would give us a better reply on the subject.
As for who asked me about who I bought it from on ebay, sorry, but I prefer not to reveal his name, as this is probably not something he is responsible for. I hope you understand.
In the meanwhile, can anyone else open their D18 and check? Maybe we can find a pattern here...
So curiosity got the better of me, and since the D18 was about the only equipment I hadn't had a peek into, I just did:
I've had mine for a while, still with the green power button. I think the "official" photos may have been of a pre-production board. However it is pretty obvious that ggmesquita's board was put together by technician who was somewhat inexperienced, in a hurry, having a bad day, or a combination of those. I guess since it passed QC in terms of working, it shouldn't affect sound... they probably assumed what consumer will look inside anyway? :\
If you want to check yours, a tip: you only have to remove the top 2 corner screws in the front & back, the top half can then be lifted off (may require a bit of prying depending how straight the front & back plates line up) That's some solid build quality though, given how thick the plates are.