What was found
AIRCRAFT WAS GROUNDED: PILOT REPORTS ON TAKEOFF RIGHT WING FUEL GAUGE DROPPED TO 8.0 FROM 8.5. TOTALIZER WENT FROM 28.5 TO 27.3. FUEL BURN CALCULATION SHOWED ONLY CENTER TANK FUEL BEING USED. FUEL LOG ACCURATE WITHIN +- 500LBS. CTR PUMPS OPERATE NORMALLY. THE WINGS SHOWED A 500 LB IMBALANCE UNTIL CTR TANKS WERE DRY. NO CROSSFEED PERFORMED AND WINGS WERE MARRIED UP AT 75LBS EACH. RT WING FUEL INCREASED 500LBS AFTER LANDING 5.2 TOTAL AT GATE 5.2 TOTAL 20 MILES BEFORE LANDING. MAINTENANCNE IS CURRENTLY TROUBLESHOOTING THIS ISSUE. ***SUPPLEMENTAL TO BE ISSUED UPON COMPLETION OF FINAL CORRECTIVE ACTION.*** (OPEN)