A: Triton regard the valve as a sealed unit so you are going to have to replace it.
The replacement is fairly straight forward.
Turn of the water and power you then have to dismantle most of the inside of the shower to get enough space to slip the old part out and the new part in.
This sounds more difficult than it actually is, however you do have to be methodical noting where screws/nuts etc. come from and what goes where and it is always a good idea to take photos as you go because you can refer to them when you are rebuilding.
Answered 521 days ago | The Doc