This is a long shot but does anyone have a photo of the USB Charge board wiring? I have a pair here that somebody has used a blowlamp to get the port off, Luckily the tracks are all good but some of the NC and filter cables were desoldered. A new port is fitted but there isn't a sniff of any marking on either side of the headphones as to the cables use. Here's hoping 
Cheers
Simon

Cheers
Simon