My starboard engine had small amount of metals in the oil analysis and also had lower oil pressure than the port side. We changed out the oil pump and bearings and everything else looked good so stopped there. Bearings were showing slight wear problems. After starting again the oil pressure seemed unchanged and at temp and on start up was running around 10-12psi about an 8 degree difference from the port engine. We checked the oil pressure gauge with a manual gauge and it was reading the same. We did not change the oil pressure relief valve as it appeared good during an inspection. We are not sure what to check at this point but maybe go back inside and change out the relief valve. Any other ideas since now we are going back inside or better yet a test we can do so we don't need to go back inside?