Turns out we did have glitch in the polarity change over on the Left Dipole. Upon ramp up of the power supply we discovered that we could not get a lock on the MNR. After further investigating the problem we noticed that we did not have a Positive indication next to the readout on the tools page. Traced problem back to the polarity proximity switch. The magnet for the switch had been taped on with masking tape and had fallen off. Made temporary fix to the proximity switch magnet:Issue resolved.