Did you have the same DTC's before the Dealer changed the Twist Grip, or only after ?
I think that P2127 "Twist Grip position sensor 2 short circuit to ground" is the most relevant,
and the other two are probably thrown up as a result of it,
so once the Twist Grip problem is fixed then the other two "faults" will also clear.
Id the same DTC's
were present before the Twist Grip was changed,
then it may be that the fault lies somewhere else in the circuit.
I don't have access to the wiring diagram right now, but other similar problems have been
as a result of "tight" wiring around headstock causing wires to be pulled out from either
the switches and controls on the handlebars, or the base of the Ignition switch assembly.
Keep us posted !
