nichur

Would anyone here be able to assist with my repair attempt?
I had 2 US2000 fail with obvious swollen cells, I swoped out one cell pack to try make a healthy battery, however the battery now only charges to 80%, however the total US2000 voltage shows as full (53.2V)
Battery view shows that the swoped cell pack only gets to around 3.3V per cell while one of the other pack shows over voltage 3.6V, thus the total voltage gets to the 53 plus voltage.
I have tried an external regulated power supply to recharge, but once at the 53.2 volts BMS stops the charging with the unbalanced cells.
Any idea how I can balance these?

That's what we do best. Giving meaningful solar advice comes in second place.

Ok. Respect! 

 
You must have a bad setting somewhere, or ICC (?) is sending a bad one (perhaps a bad configuration for it; sorry, I'm not familiar with how it works). It nearly has to be setting 02 (from memory, maximum  total charge current) being not much more than maximum utility charge current. 
That's assuming it stays like that, with the battery voltage near  the CV setting. If that's actually your float voltage, or it goes to your float voltage later in the morning,  then it could be the charge bug, and you need the patch.

Any update or progress here?
How do I see what firmware I am running currently?

I have come across some weird setups, lol. I am not sure how you set that inverter priority. As far as I know you can only set the charge priority.
When I leave the house or over weekends when I am not home, I will select the SOC at the same time. Murphy's law - When I leave the house it becomes overcast and starts to rain. I don't want to stay on solar until 18h00 because of the time setting and run my batteries into the ground because there is no sun. If you select SOC setting at the same time, it will go to grid, depending on your SOC setting, irrespective of the time setting. Whichever comes first. 
I agree. No other way to have complete control over your system. I VNC to my PI from wherever I am. Check the graphs and log out. If I think I am wasting my time running from PV, I change to grid and disconnect.