Who did you buy from? They may be lenient - Elektron advised me to go through my retailer first before hitting them for a solution on the sticky key issue. I initially hoped for a replacement but stock issues meant a wait of several months. By the time stock was in I asked for a return on a faulty unit with no problems - that was with Juno. Worth chatting to your retailer though.
In my case, none of the fixes worked on my two sticky buttons. Was enough of a buzzkill to return for me. Quick play on chromatic mode, for example, was impossible with those buttons.