What was found
AIRCRAFT WAS GROUNDED. MIA-LHR DIVERTING JFK ACCOUNT CENTER TANK FUEL LEAK. EMERGENCY WAS DECLARED AND FLIGHT WILL BE LANDING OVERWEIGHT. SUSPECTED FUEL LEAK IN CENTER FUEL TANK (FUEL DISAGREEMENT BETWEEN TOTALIZER AND FUEL INDICATION - 10.500 LBS WITHIN 30 MINUTES). ACCOMPLISHED M/M TASK 28-41-00-710-802 FUEL QUALITY PROCESSOR UNIT OPERATIONS CHECKS. ALL CHECKS NORMAL. ACCOMPLISHED M/M TASK 34-61-00-730-801. FMC SYSTEM TEST. ALL CHECKS NORMAL. CHECK AHM AND BITE CHECK MAT. NO FAULTS OR HISTORY. REPLACED THE FUEL QUALITY PROCESSOR UNIT AS PER M/M 28-41-01. ALL OPERATIONS CHECKS NORMAL. TECH NOTIFIED OF ALL FINDINGS. AIRCRAFT OK FOR SERVICE.