Haven't done anything to mine but did all of the service to get everything up to date. I don't have any issues with fuel, oil or antifreeze being where it shouldn't. If it were to be a problem, my car still has 45k miles of the extended diesel gate warranty.
Hard to say if its fuel injectores or not? if it starts right up on cold/hot i would rule them out could be something not getting oil me personally i would do an engine flush using a product like BG EPR or Moter medic 5 min synthetic engine flush.
I bought a liter of Power Service Diesel Kleen at Canadian Tire store, and poured the specified quantity in the tank and after consuming the whole tank, the ticking from the HPFP is almost gone. I will definitely pour some Diesel Kleen on a regular basis.