What was found
TANK 3 TIP TRAPPED & TNK 3 FUEL QTY LO ALERT AT CRUISE FUEL QTY- 21.0K, QRH COMPLIED WITH. ELECTED TO PUT FUEL SYSTEM MANUAL AND TRANSFER FUEL FROM TANK NR 2. ALERT WENT AWAY. FUEL SYSTEM BACK TO AUTO. ALERTS RETURN DURING ARRIVAL AND APPROACH. FUEL QTY 16K. EMERGENCY DECLARED WITH ATC. LEAK CHECKED IRW MM 28-00-00-2-1. LEAK CHECK GOOD. REMOVED, REPLACED, AND INSPECTED TRANSFER FLOAT VALVE AND TRANSFER VALVE, INSPECTED IRW MM 28-21-10-2. OPS CK GOOD. REMOVED REPLACED AND INSPECTED TRANSFER FLOAT VALVE MOTIVE SHUTOFF VALVE, TRANSFER SHUTOFF VALVE, AND JET PUMP IRW MM 28-21-10-2/ 28-21-11-2 OPS CHECK GOOD. REMOVED AND REPLACED FLOAT SWITCHES (S1-122), S1-124), (S1-178) IRW 28-43-01-2. OPS CHECK GOOD. INSPECTED WIRING IRW WDM 28-41-08. NO DEFECTS NOTED