I cut open the liner and found the burst pipe just like you said, after a fair amount of cursive language I managed to sort that issue, then on to the cut in the liner, I tried various patches and glue to no avail, I then had a brain wave to stitch the liner together with fishing line then patch over the top, the stitching worked well but the patches still couldn't cope with the air pressure, next idea (and running out of them)along with the stitching I put a layer of everbuild fix all over the stitching, let it set and pressured it up and had two tiny holes so I put another thick layer of fix all over the top and let it set, hey presto it's holding tight. Hopefully permanent