What was found
SJO - FLT 660 - DURING THE FLIGHT, THE CAPTAIN REPORTED FUEL IMBALANCE INDICATION, THE AIRCRAFT RETURNED TO SJO STATION FOR MAINTENANCE. AFTER LANDING, MAINTENANCE PERSONNEL PERFORMED OVERWEIGHT LANDING INSPECTION IAW AMM 05-51-11, AND DISCREPANCIES WERE NOT FOUND, THEN DURING TROUBLESHOOTING OF THE CENTER FUEL TANK WAS FOUND THE OVERPRESSURE DISK BROKEN, IT WAS REMOVED AND REPLACED REMOVED IAW AMM 28-22-27. OPS CHECK OF FUEL INDICATION WAS PERFORMED WITH SATIFACTORY RESULTS AND THE AIRCRAFT WAS RETURNED TO NORMAL OPERATION. (M)