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Do you have any pictures?
I have a good amount of experience with lithium cells, I have CALB 180AH in my Civic EV.
If it was me I would remove the BMS rats nest (using gloves) and get the cells all cleared off. Then I would test each cell with a multimeter and one by one charge each cell up with a bench power supply to 3.5 volts and see if they hold a charge.
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