As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE ACCOMPLISHING TASK CARD POWER PL-79 FCD-12377-1, FOUND EVIDENCE OF LEAK ON THE NR 1 ENGINE TURBINE FRAME AFT SUMP. ACFT GROUNDED. ACCOMPLISHED T/C POWERPLANT-79FCD-12377-4: CFM56-7BE TURBINE REAR FRAME AFT SUMP FCD: INSPECTION AT NR 1 ENGINE. OPS LEAK CHECK OK.