As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RIGHT FUEL TANK QUANTITY DECREASED 1500 LBS DURING CLIMB WHILE BOTH CENTER TANK PUMPS ARE ON AND OPERATING. FOUND PRESSURE RELIEF VALVE LEAKING. REPLACED PRESSURE RELIEF VALVE IAW AMM 28-21-08. OK TO CLOSE RT MAIN TANK ACCESS DOOR 541HB. LEAK CHECK OF PANEL 541 HB GOOD.