I was able to get back into the u.p.s. room to follow up on this unit. The unit is a single feed with a bypass switch,no aux circuit. I took a few voltage readings and found 8.25 volts between neutral and ground from the xfrmr through the ups and also into the panel. The voltage between each phase and neutral varied from 112 on phase a,to 125 volts on c phase. I installed a temporary jumper and the voltage leveled out and the voltage between neutral and ground went to zero. next is to schedule a shut down and install a permanent system bonding jumper and a gec to the building steel.
Rick