Did you have any luck with this?
I acquired a Wattbox WB-600-ipvce-12 with my house. same exact issue.
Unfortunately they said it has to be replaced thru a dealer, and I have no idea where it was purchased from. Seems if it has a lifetime warranty, place of purchase would not really matter.
(I do corporate A/V work. Though not home install, I am a A/V professional)