Symmetra LX16000 XR Frame error E0

[avecchio]

I have a older 3P LX16000 with 1P 240v output - configured n+3 (4/5 power modules 4/4 Batteries) with an XR Frame SYAXR9B9I (9/9 Batteries) - 2 x SYMIM5 513 / 602 & AP9641 NMCv3 05 sy v2.5.0.3 aos v2.5.0.8 boot v1.5.1.1

We currently are experiencing a E0 error on our frame.

I have cold booted UPS, checked/re-seated Andersen plug and applied electrical contact grease, re-seated all modules.

Having no service manual, I did not check the fuses in the XR as was not sure on the live procedure or test points.

The NMC is currently reporting 152VDC as the Battery Bus Voltage.

Our other similar UPS in another location is showing a Bus Voltage of 139.2VDC

Is there a procedure to correctly diagnose a E0 fault

Attached is my Raw Battery data