Get some gas leak detection spray and cover all the high pressure fittings, including Q/F and gauge, any bubbles will indicate a leak, also with the bolt locked forward, smear a little soap solution over the end of the lcd, a bubble there will indicate a valve sealing issue.
report back for further advice.
Better still, I strongly recommend you join the rapid 7 owners club, while it mainly covers all things rapid there are some members who own RAWs and to be honest most of the part are the same anyway. The technical section has all the pfd’s you are likely to need and good advice on how to do it.
Raw’s and rapids are great guns, but with a few upgrades they can be made a whole lot better.
Bb