As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RTFL DUE TO NR 1 OIL QUANTITY LOSS INDICATION. THE ENGINE'S ANGLE GEARBOX (AGB) WAS REPLACED AT HNL, AND THE AIRCRAFT RETURNED TO SERVICE. PROBLEM DID NOT RECUR. SHOP INVESTIGATION FOUND THAT THE AGB SNOUT PACKING (IPC 72-62-00-001-001) WAS WORN FLUSH WITH THE GLAND. PACKING SHAVINGS WERE PRESENT, AND THE PACKING ALSO HAD TEARS. THIS IS A NEW FAILURE MODE. THE PACKING DID NOT EXHIBIT ANY CHEMICAL DETERIORATION; ONLY MECHANICAL DAMAGE WAS EVIDENT.