As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
COOLANT FLUID WAS SEEN AFTER FLIGHT, BY THE CREW. TROUBLESHOOTING AND TEST INDICATED A CYLINDER HEAD LEAK OF SOME KIND. THE HEAD WAS REPLACED WITH A NEW PART AND SUBSEQUENT GROUND TESTS AND FUNCTIONAL CHECK FLIGHT RESULTED IN NO MORE FLUID LOSS.