I know you've probably tried this, but did you try clearing the fault codes in the BMS then checking for codes again ? For that type of fault they probably won't clear themselves after the fault is repaired, you will have to manually clear the codes.The problem of the CMU reporting the voltage as abnormal remains, as does a report of all cells except cell B having low voltages, despite the fact that the voltages look normal and similar to all the other cells in the battery.
However, the fluctuating low voltage value on cell H had gone, so maybe that was caused by the LTC chip, or a connection to it from the PCB.
Although you only noticed one cell visibly dropping to an abnormally low voltage keep in mind the communication rate to the diagnostic tool for the voltage readings is very low - only one or two updates a second would be typical.
So the other cell readings could have been dropping for milliseconds - long enough to set faults by tripping a low voltage threshold in the chip, but not long enough to be caught by the real time display of cell voltages due to the low effective sampling rate you have viewing the cell voltages via the diagnostic tool.