PPM002 Error in Diagnostics but memory tests pass
I have a Mac mini Late 2014, it works fine when im using it but cannot update OS not install new one, each time I try to do it, it comes with up error and points to running diagnostics due to a hardware fault. Ran diagnostics and came back with PPM002 error pointing to an issue with memory module (crappy onboard on this version of Mac mini so can't replace). However when I Run a memory test software like Rember (I've tried a couple of others too) all memory tests come back with no issues. I've attached pics of the diagnostics screen as well as the memory tests.
Any help is appreciated.