IP1 controller has indicated that pump B (1/2 of pump) has been inoperative for awhile now -> Swapping cables didn't change the indication at the controller that pump B still isn't working but has resulted in the "cold" 1/2 of the ion pump to be pumping now (i.e. problem is controller not HV cable or pump) -> CS pressure shows a "bump" reflecting this exercise -> IP1 controller is old style "MultiVac" type and cabling will need to be modified for, as yet to be acquired, new type replacement.