We tried to tweak the PMC beam alignment last week, which coincides with the increase in PMC Refl variation.  We did not see any change in PMC Trans with the tweak, but clearly the PMC Refl signal became more noisy.  At this time I'm not sure why this happened.  We've seen in the past that the PMC alignment being off can cause the Refl signal to get very noisy, which is cured by fixing the alignment.  Not the case here, as the alignment was already good when we tried to tweak it.  I don't see anything in the other trends that would indicate a reason behind this more noisy PMC Refl.  We'll continue to monitor this.