If you didn't see any coolant come out with the oil when the oil was drained, I would suspect head gasket, warped head, or cracked cylinder.
No I didn't see any coolant in the oil. But bike has not run since oil change. Oil was dirty though, especially for not actually being in a running engine!
I took the HPP system apart. Coolant appears to be coming from behind valve assembly. I take out assembly and I can see the piston behind it. HPP componants a bit soiled and a little sticky. Looks like I will wash these parts on solvent before assembly with new gasket. I also found the valve washer to be in the incorrect place, it was supposed to be sitting where the lower orange arrow is