  Under the assumption that the concordance Lambda-cold dark matter (CDM) model
is the correct model, we test the cosmic microwave background (CMB) anisotropy
data for systematic effects by examining the band pass temperature residuals
with respect to this model. Residuals are analysed as a function of angular
scale l, galactic latitude, frequency, calibration source, instrument type and
several other variables that may be associated with potential systematic
effects. Our main result is that we find no significant systematic errors
associated with these variables. However, we do find marginal evidence for a
trend associated with galactic latitude indicative of galactic contamination.
