I have a Evovinil 6 man life raft that was due for recertification in 2008. I opened up the bag today and it seems in perfect condition but again i didn't auto inflate so i really dont know. Is there any reason why i cant just purchase a new compressed bottle from the manufacture and change it out myself? I would of course inflate with the old bottle to make sure it holds air etc. What is so complicated about it that everyone "sends it in" for repair? How much does it generally cost for a 6 man raft? I know this probably doesn't meet coast guard regulation but my boat is used for family trips only. Your input is appreciated.