What was found
FLT JB1328 BWI-BOS DIVERTED TO JFK, AT FL 270 BLEED 2 LEAK CAUTION MESSAGE ON EICAS. FOLLOWED QRH PROCEDURE MESSAGE CLEARED AFTER 1 MINUTE (END OF PROCEDURE), AT APPROX 5 MINUTES BLEED 2 LEAK CAUTION APPEARED. FOLLOWED QRH PROCEDURE ISOLATING OPPOSITE SIDE BLEED AND APU BLEED. DESCENDED TO 10000 FT PRESSURIZATION DUMP BUTTON (PUSHED IN) BLEED 2 LEAKED PERSISTED, DECLARED EMERGENCY DIVERTED TO JFK. MESSAGE CLEARED ON APPROACH AT LOWER THRUST SETTING. RE-APPEARED AFTER LANDING, LANDED 22R SHUTDOWN ENGINE NR 2, BLEED LEAK 2 MESSAGE CLEARED. MX T/S CMC ACTIVE MESSAGES SHOW ODS PACK LOOPS RT BLD C1&C2 MESSAGE'S. PERFORMED FIM 36-21-00-810-802-A, PERFORMED VISUAL INSPECTION OF BLEED DUCTS RUNNING ALONG LOOP 5, NO DEFECTS FOUND. BLEED OVERHEAT LOCATION WAS AT 6.25 ON CH2 & AS A BLEED 2 SHORT CONDITION AND 41.55 ON CH 1 AS A BLEED 2 OPEN CONDITION. REMOVED AND REPLACED CERAMIC PINS AT CONNECTORS P2146 & J 2348 DUE TO CORROSION PER AMM 36-20-01, PERFORMED AMS RESET AND ODS BIT PER AMM 45-45-00, FAULT CLEARED RAN NR 2 ENGINE NO MESSAGES. A/C RETURNED TO SERVICE.