  We present non-Gaussianity testing on recently-released derived maps from the
first-year WMAP data by Tegmark, de Oliveria-Costa and Hamilton. Our test is
based on a phase mapping technique which has the advantage of testing
non-Gaussianity at separate multipole bands. We show that their
foreground-cleaned map is against the random-phase hypothesis at all 4
multipole bands centered around l = 150, 290, 400 and 500. Their
Wiener-filtered map, on the other hand, is Gaussian for l < 250, and marginally
Gaussian for 224 < l < 350. However, we see the evidence of non-Gaussianity for
l > 350 as we detect certain degrees of phase coupling, hence against the
random-phase hypothesis. Our phase mapping technique is particularly useful for
testing the accuracy of component separation methods.
