RIP CM2250, 2013, 800,000km 20,000 hrs

[Hermjeji]

So.

Head #6, new actuator, new fuel pump actuator housing, new fuel pressure relief valve. After 12 hours of operating, started losing power again. It's failing the leakdown test now, but it can't make pressure above 20,000 psi. No visible leaking on the top of the head yet, but I assume another several hours of running and it would start.

I am getting an odd ticking sound coming from the main rail line (also when the key is turned on, it takes a while for the usual ticking noise of the pressure being built up to stop). I'm going to pull the valve cover off, and see if something else is going on (also due for an overhead). But, could anything on the top end be causing these repeated fuel pump heads to go? I don't know what to do at this point.