What was found
AIRCRAFT WAS NOT GROUNDED: 2 HOURS INTO FLIGHT IN LEVEL CRUISE, LEFT MAIN FUEL QUANTITY BEGAN TO SHOW FUEL DECREASING AT APPROXIMATELY 100LBS/SECOND. AT APPROXIMATELY 1500LB IMBALANCE IT STOPPED AND STAYED AT A 1500LB IMBALANCE. TROUBLESHOT IAW TSM 28-41-00-810-801, FOUND FAULT MESSAGE TANK 1 QUANTITY BLANK ATA 28-41105 HI-Z OP/SHORT TO SHIELD. **SUPPLEMENTAL REPORT FOR (AALA202504282845): REMOVED AND REPLACED, AND BITE CHECKED LEFT WING FUEL COMPENSATOR. PER AA B737 AMM 28-41-21-401. BITE CHECK PASSED**(CLOSED).