I tore down the second segment. 120v nominal now 2x48 and 1x24. Tomorrow I test charge the 2x48s.
I also tested all the other cells very carefully. They all come in at 3.83 or 3.84. So the low cell is the only one. Whew.
For the pic of the day. The second part of the BMS. What are those big green things do you suppose?