I don't see any pictures that suggest this has a drain valve. It would have to be connected to that front distro-plate, so it would be easily visible. The PowerSpec X600 series also does not have a drain valve in both the prebuilt systems or the kits.
As for local shops, I do know that EKWB processes warranties through my local Micro Center store, so I imagine they have partnered with some retail locations to help with servicing/repairing under warranty. I just can't find a list of who those retailers are at this time.