I have opened a HK branded Li-po when it stopped supplying any current - what I found inside was a small piece of PCB cut in the shape of a flattened X - the two tags from each cell were wrapped round the legs of the X to give the 2S configuration and poorly soldered - the board was also cracked and the copper strip attached to the PCB had burnt through.
I resoldered all joints and added a piece of copper cable across the crack in the board and filleted it neatly with solder. Worked perfectly since.
You may have something similar in your pack - but I recommend getting someone competent to do the job - and then the pack can only be classed as 'safety' compromised....meaning that you shouldn't really use it for insured events because it won't really be covered.
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