As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF, AT ABOUT 1500 AGL, THE LEFT ENGINE OIL AURAL WARNING CAME ON. CONCURRENTLY HEARD RCCB'S CLICKING AND THE OIL NEEDLE FLUCTUATED. RETURNED TO DEN. ADDED 4 QUARTS OF OIL AND COMPLIED WITH ST72-344. NO DEFECTS NOTED. LEAK CHECK GOOD.