My dealer installed my OEM heated grips about 2 months ago. They failed on 12/24, 10 miles from home in Mansfield, MA. The flatbed took her away just about two hours ago, back to my dealer for warrantied repair (out of pocket for $350 in towing, however). It seems almost for sure that the (plastic) throttle cable retainer fractured, as per other complaints/reports i have read here.
Up to this point I liked them a lot, but I am not getting good vibes from Triumph about this. It is a known issue and seemingly, they will not acknowledge it. Pretty GD disappointing, so far...