When I first got the Air Beam frame for my Gossamer Gear Mariposa, it was fantastic. It made it so comfortable but after a couple of years, it started to slowly deflate, so I’d have to add air every hour or so. It got worse and worse until it was unusable. I couldn’t find a leak so I just put it at the back of the gear cupboard and forgot about it.
Recently a member of Trek-lite forum said they had cured the problem by using a silicone stopper. Apparently the problem was not the frame itself but the valve in the bulb that is used to inflate it. I couldn’t find a silicone stopper but a yoga ball plug looked promising (and cheap) so I ordered some from Amazon. To my amazement, it cured the problem and there was no deflation, even after leaving it inflated for a week. Next time I go out I’ll give it a proper test but I’m confident I’ll be able to use the Air Beam again. It will also work in my GG Murmur pack.