As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PASSING 20K LT ENGINE OIL QTY DECREASED ALL THE WAY TO ZERO. ENGINE POWER REDUCED TO IDLE.ON DECENT ALL INDICATIONS RETURNED TO NORMAL. CHECKED OIL AT TANK, FULL. INSPECTED OIL TEMP DECALS AND EXAUST AREA, OK. CREW REPORTED OIL PRESSURE DID NOT DECREASE. A/C OK FOR CONTINUED SERVICE. FWD LT ENGINE OIL QTY INDICATION DEFERRED PER MEL 79-00-03.