2024 x15 ticking at 1400 rpm

[RickatGL]

Hey everyone
I have a 2024 W/S 49x tridem boom truck, I've heard this ticking noise awhile now about 3,000km. Seems to do it more often and its easier to get the engine to make the noise. It is one of those does it when it feels like things. Anyhow has the cm2450 x15 605hp/1850 in it. 3.73 gears, endurant xd 18 spd. Ticking noise is most noticeable right before the fuel pump flips highside around 1400 rpm. Noise can be quite loud. As soon as the pump kicks up it hard to here over that pump rattling noise but if you hold light throttle slight load it will tick for miles im sure it even seems to change exhaust note. The ticking has bothered me, I've had it to the dealership 3-4 times twice the have gotten. It to make the noise, told me it was compressor related or maybe it the def system running. Sounds very much like a valve tick but like a heavy tick or some king of injection pump noise. This truck has around 350 hours and just over 10k km. Dealerships have no idea what they are up against. It's an intermittent issue. Any ideas what the issue is, im not at all familiar with this engine at all. Thanks in advance.