Rising oil level N14

[Ace206969]

I have a N14 Celect Plus which is gaining oil. Contaminated with fuel at a rate of .1 gal per 1k miles. Replaced the transfer pump recently because the front seal was out. Still getting fuel in the oil but the trick runs like a champ. Where should I start in tracking down the problem? Running dye in the fuel system to check for a leaking fuel injector? Motor has 400k miles and ecm was programmed with a straight 525HP program by the dealer. Motor came as a 500 if that makes any kind of difference. I will also attach oil sample results.