As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FUEL CONFIGURATION ANNUNCIATOR LIGHT ILLUMINATED AFTER REACHING CRUISE AT 36000€™ DUE TO AN IMBALANCE BETWEEN LEFT MAIN AND RT MAIN TANK.(RT TANK LOWER THAN LEFT BY 1,900LBS). ++ALL MAIN & CTR PUMPS WERE T/SHOOT PER FIM 28-41-FAULT TREE854, NO FAULT FOUND. A/C OK FOR SVC.