For a few days, I had a feeling that the icky greens had returned on my LK450. So I pulled the i1D2 out of storage and verified that it was still reading the primaries in the same place (+/- 0.0015 ish.) Assuming that it's still reading Y correctly, the display had lost ~25% of it's post calibration brightness (103Nits down to ~76Nits) ... and that the greyscale was now tracking to the green side.
A couple of calibration runs later and all is well again. I decided to limit the peak white to ~90Nits (26ft/L ... ish) which seems to be plenty in my viewing room ... this only required a modest increase on back-light drive (30 -> 33.)
Which is a long way of saying, ya'll are probably going to want to recheck your calibrations once you rack up 2300 to 2400 hours. As always, YMMV.