Dad changed the oil in his truck (05 6.0) and backed it out of the shop and parked it. Next morning-no start. Not building more than 200psi HPO, ipr full closed (84%). So I pulled the filter since i don't believe in coincidences, and the filter bypass valve was broken. the top part and the spring was there, but The bottom of it (2 small plastic ears) broke off and appears to have gone down into the HPO reserve tank, and I am sure is causing a blockage. I am guessing the screen under the oil cooler is torn, because it never had the cooler replaced, and the plastic made its way back toward the HPOP. My question is, is there a chance its stuck in the passage between the oil reservoir and the HPOP? Or could it actually be in the HPOP, keeping it from pumping? Its making about 200psi.