As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WITH FUEL PANEL CONFIGURED TO BURN OUT OF NR 2 TANK ONLY, 900 POUNDS OF FUEL WERE USED FROM TANK NR 3. ALL X-FEEDS WERE OPEN AND FORWARD PUMPS WERE OFF IN TANKS NR 1 AND NR 3. AFTER CORRECTING IMBALANCE BETWEEN TANKS NR 1 AND NR 3, RECONFIGURED FUEL PANEL TO BURN OUT OF NR 2 ONLY. NR 1 AND NR 3 QUANTITIES REMAINED EQUAL. *S/D* FOUND CRACKED FUEL TANK ELBOW. REPLACED ELBOW.