What was found
AIRCRAFT WAS GROUNDED: ON TAKEOFF, AIRCRAFT DEVELOPED A 540 LBS FUEL IMBALANCE BETWEEN THE LEFT TANK AND RIGHT TANK. THE IMBALANCE REMAINED BETWEEN 540LBS AND 400 LBS. DUE TO RECENT AIRCRAFT FUEL LEAK, WE OPTED TO NOT BALANCE THE FUEL. THE LEFT TANK IS THE LOW TANK. REMOVED AND REPLACED AND BITE CHECKED LEFT WING FUEL COMPENSATOR (AALA202412104314) AND PROBE NUMBER 10 (AALA202506045050), PER B737 AMM 28-41-21-401. BITE CHECK GOOD.