As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RETURN TO SFO DUE TO LOSING OIL IN NR 1 ENGINE. *S/D* FOUND FUEL COOLED OIL COOLER (FCOC) OUTLET LINE LEAKING AT FITTING (REF A320 IPC 79-21-09-80 /ITEMS 110 & 120). TIGHTENED ONE HALF TURN. REPLACED SCAVENGE OIL FILTER AND CHECKED MAGNETIC CHIP DETECTOR. RAN ENGINE AT 1.2 EPR FOR 10 MIN. LEAK CHECKS GOOD.