As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER CLIMBING TO FL 310, NR 1 FUEL TANK QUANTITY WENT DOWN 600 POUNDS, WHEN ALL ENGINES SUPPLIED FROM NR 2 TANK WITH ALL CROSS-FEEDS OPEN. NR 1 FUEL TANK VENT TUBE ELBOW CRACKED AT THE WELD AREA. REPAIRED AND REINSTALLED VENT TUBE ELBOW.