I can replace the plugs. I did replace them last year but I ride it a lot. It probably has 10K+ miles on those plugs.
What are HT and LT? If it's the spark plug wires I checked both ends as well as the wires on the other side of the coil.
HT= High tension, the cables that dish out the high voltage to the plugs.
LT= Low tension, the normal thin cables that connect to the coil primary side.