I have a Keylab25 and it also got a key problem, as one got detached from the weight due to the inferior quality glue being used. I returned the Keylab to the shop were I bought it and they sent it to the repair central elsewhere. Then it was a matter of waiting, waiting, waiting. Weeks passed and after over six weeks it had finally returned to the shop and I rushed to take it back.
From what I understood It also had been abroad, probably to Grenoble, where they put a very different type of keybed inside which doesn't seem to have all this rubbish glue. It looks more sturdy now and I expect it to last much longer now.
I'm glad they put in a different type, because indeed I was worried about a repeat with detaching weights after this repair.
Knowing this I can only urge anyone to not go DIY in order not having to wait. Without your warranty you'll end up being stuck with a crappy glued-together keybed. Fixing a warranty-void instrument might cost you just as much as a new one.
In my opinion all Keylab instruments with the older glued keybeds should be withdrawn and replaced before someone buys them, because to sell a faulty product is just not okay. Unless someone at Arturia hopes that more people will screw up their warranty so they can keep their hands off the problem. But that philosophy would be a bit too cynical, wouldn't it?