Well I really thought it was good, I checked about 2hrs after a drive and it was dry. Checked next day and there's a very small pool under the car – must be a super-slow leak from.. somewhere. It doesn't look like it's the main connections.
@Philia_Bear you said they tested the rack after refurb, assume that means putting it under (hydraulic) pressure which you'd think rules out any of those small lines that are part of the rack.. though they are my main suspicion.
I couldn't get it in for inspection until next Monday, not sure what to do in the interim but I can always try to hide the slow leak by putting the undertray on..
What a pain.
As of yesterday we are a zero car family! Gaaaah