For the duration of the current post-O2 Vertex+YBM+XBM vent and up until a few days ago, the two Bayard-Alpert/parani wide-range pressure gauges located at BSC7 and BSC8 have been "railed" at their maximum pressure reading of 750 torr.  Recently, however, they are both "on-scale", i.e. reading less than 750 torr.  

I assume that this is the result of the recent weather (low barometer) and not related to the recent purge air supply issues.