As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHIP 6822 -ATB/IFSD- CREW PERFORMED ENGINE SHUT DOWN AND AIR TURN BACK DUE TO RT ENGINE OIL QUANTITY DECREASING TO ZERO INDICATED WITH ASSOCIATED OIL PRESSURE DROP. CORRECTIVE ACTION: FOUND BREATHER LINE TO GEARBOX BROKEN. PERFORMED WIND MILLING INSPECTIONS AND REPLACED THE BREATHER LINE ASSEMBLY. R/R MAIN ENGINE OIL FILTER, NO METAL FOUND. HIGH POWER RUNS GOOD.