What was found
ORD - FLT 50 - APPROXIMATELY 45 MINUTES INTO THE FLIGHT THE FUEL GAUGE AND SYNOPTIC WENT BLANK FOR ABOUT 30 SECONDS. APPROXIMATELY HALF AND HOUR LATER GOT A FUEL IMBALANCE EICAS MESSAGE AND RIGHT TANK DROPPED TO 34.5 WHILE THE LEFT TANK REMAINED AT 54.5. THERE WAS NO EVIDENCE OF A LEAK AND AFTER APPROX 30 MINUTES THE RIGHT GAUGE GRADUALLY INCREASED BACK TO 54 AND FUNCTIONED NORMALLY. T/S FOUND EXISTING FAULT 28-20050 FQPU INTERNAL FAULT. REPLACED FQPU AND ACCOMPLISHED TESTS PER MM. ALL CHECKS NORMAL. (M)