My 2 cam cover gasket repairs (so far) have both been covered under warranty. Triumph doesn't want the dealers applying any sealant to the gasket, but that's the only thing that seems to work. My dealer applied some last time and the gasket has been holding strong. Some members here have had warped cam covers and others have had factory powder coating oversprayed onto machined surfaces.
Lemme guess... is yours deforming/leaking on the exhaust side right behind cylinder 1?