What was found
AIRCRAFT WAS GROUNDED: RIGHT MAIN FUEL TANK INCREASED FUEL BY 400-500 LBS DURING FLIGHT WITH NO CHANGE IN FUEL PANEL CONFIGURATION, EACH ENGINE WAS CONFIGURED TO BURN FROM EACH TANK SEPARATELY. ON DECENT, FUEL QUANTITY ON NUMBER 2 MAIN TANK WAS INCREASING, NO FUEL ON THE CENTER TANK. AND NO ABNORMAL FUEL USAGE ON NUMBER 1 MAIN TANK. POSSIBLE FUEL QUANTITY INDICATION PROBLEM. **SUPPLEMENTAL REPORT FOR (AALA202501299860): REMOVED AND REPLACED FORWARD (AALA202501299860) AND AFT (AALA202501304517) BOOST PUMP CHECK VALVES AND RIGHT HAND BOOST PUMP BYPASS VALVE (AALA202501304927). PER AMM 28-22-71 AND 28-22-61 BY TANK TIGERS VENDOR ON W/O TT 01150 LEAK AND OPERTIONAL CHECKS NORMAL**(CLOSED).