If it was bad enough to have rocks :shocked: in the HPOP inlet screen, then they went thru the LPOP to get there. It may be worn enough that it can't pump any oil. I think that engine is toast. Running it before THOROUGHLY fllushing out everything, including the oil galleries was a bad idea. It probably has grit in the bearings and just about everywhere else. Time for a complete teardown and rebuild (if possible).