Should I sew seams on goretex jacket?

[jacol]

I bought Alpinestars Adventure goretex jacket from george white when they started end of season sale. Today I noticed that seams split just by the collar

I don't think they have them in that size anymore so I can't have it replaced, I don't want my money back as I paid £99 whereas it's between 3 and 4 hundred pounds elsewhere and I won't find other goretex jacket for that price, so I thought maybe I should sew that seam? Will it be waterproof? I don't know which part of goretex jacket is the waterproof part... Is it the outside or inside?

I'll visit george white on Saturday and see what they say but I thought I might as well ask here.

[Tango]

Normally the GoreTex is behind the outer material....kinda like a membrane backing the outer material. I guess carefully restitching the seam would not hurt too much....at the end of the day what have you got to lose.....apart from the waterproofing....