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don said..
Can't do it as it's in the centre strut. Just happened again as I inserted a new replacement bladder. Have to remove and repair an unused bladder. Its happened to 2 of my Gong wings. Frustrating alright.
For me it's a broken needle point. Sounds exactly the same problem I had. The bigger problem, each time you take the bladder out repair and replace, it gets worse as you're dragging the bladder over the broken needle, I ended up with multiple puncture holes along the length of the bladder, not just where the specific problem was.
Try and locate the exact spot, you'll then have to get a repair shop to unpick the stitching remove the needle point and re stitch. If you can prove it's a needle presumedly Gong will have to cover your costs.
Inflating the bladder inside the strut to max pressure throwing some soapy water over the suspected area, which is what I did, should locate the spot.