As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RT TANK QTY INCREASES 300 LBS EVERY 10 MINUTES WITH CENTER TANK PUMPS ON. OCCURS IN NORMAL CONFIGURATION, JUST CENTER TANK RT AND LT PUMPS ON. REPLACED FWD RT MAIN DISCHARGE CHECK VALVE. PROBLEM REOCCURRED. RPL'D L-H JETTISON ISO VALVE ACTUATOR. OP'S CHK OKAY.