You need to discharge each cell
individually.
Then "force" charge them
individually to a set voltage (1v)
Once done, discharge the
whole pack on a normal discharger down to 6v.
After that stick them on a discharge tray (The LRP one is good, oh or Nosram

).
Now... stick them on a charger to fully charge and monitor each cell voltage periodically during charge.
Obviously between each stage let the cells cool down...
This is the method I used on some 3700's a few season back, and it rescued them quite happily. Used them of several months after.