Barnet does have parts... And I would use it if I was in a pinch.... If I have a choice I would go back with stock steel and fiber plates and maybe add a Barnet pressure plate... I did and I really like the extra clamping force and the smooth clutch pull......
I would think it should be with the usual caveat's. normal wear and tear, abuse and neglect are out.
Fairly new bike, I definately would have a go at the dealer.
Did you try bleeding it? It could have got some air in during the tipover and in the wrong place, the air can heat up and expand and partially actuate the slave.