Will:
When I attempted to blast some air at all corners and orifices,
I found the unit
to be AIR TIGHT since I could not even move a fleck of dust. The seams you talk of
appear to be sealed in such a way that I can't even imagine anything entering through there.
Igorsk our community dis-assembler, discovered that the dust comes from within
the unit and not something that emanated externally as you and I thought. Sony
is aware and has contact individuals but since you swapped yours, hopefully
you're okay. My issues with dusk is minor and not worsening but exists.