Basically any crew can operate the DPF based on the manual that comes with the DPF system.
When malfunctions occur, usually they can service the system by themselves.
Replacement of parts, anybody can do it, any crew can do it.
When it becomes a little bit more difficult, if programming is off, that would mean that you’ll would need somebody from Emigreen® to get the system in running order again. But that only happens on a very few occasions.