As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
OIL AURAL WARNING AT V1 FOLLOWED WITHIN 30 SECONDS BY OIL PRESSURE FLUCTUATION BELOW GREEN ON RIGHT ENGINE. RETURNED TO FIELD. SERVICED BOTH ENGINES WITH 2 QUARTS OIL EACH. PERFORMED ENGINE RUN ON BOTH ENGINES. OIL PRESSURE INDICATION STEADY.