As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENGINE OIL QUANTITY DROPPED OFF RAPIDLY INFLIGHT. ON APPROACH - DROPPED AS LOW AS 12 PERCENT, 19 PERCENT AT GATE ON ARRIVAL. DIVERTED TO DEN TO AVOID ENGINE DAMAGE. FOUND OIL LEAKING FROM AROUND MCD'S. REMOVED & REPLACED O-RINGS & D-RINGS ON ALL 3 MCD'S. ALSO, FOUND RETAINING BAR LOOSE, RE-SEATED SLEEVE & TIGHTENED BAR. RAN ENGINE FOR 5 MINS. NO LEAKS NOTED. AMM 79-21-05 & ECRA 7921-01014. ADDED 14 QTS OIL.