Gunsmithing Horus scope service?

[Spot-on]

I have a Horus Blackbird scope where the red dot has failed (won't light up). Changed battery of course. I contacted Horus and they disavowed all knowledge of such a scope's existence (well, that may be a bit of an over-dramatization, but they would not fix it). Anyone know a good modern scope servicing outfit that can track down electronic problems?