What was found
DURING CRUISE, FL 280, EXPERIENCED A SYS 2 BLEED LEAKING WARNING. APPLIED AOM VOL 1 PROCEDURES AND WERE UNABLE TO RESOLVE ANOMALY. DIVERTED. A CHECKLIST DRIVEN "PRECAUTIONARY" ENGINE SHUTDOWN WAS APPLIED AND AN EMERGENCY WAS DECLARED. LANDED WITHOUT INCIDENT. ACFT REMOVED FROM SERVICE. DURING TROUBLESHOOTING, FOUND RT AFT OVERWING COUPLING O-RING BLOWN, REMOVED AND REPLACED BOTH O-RINGS IAW AMM 36-11-10. PERFORMED LEAK TEST AND OPS CHECKED GOOD. NO EICAS MESSAGES PRESENT AT THIS TIME. FOUND THERMAL SWITCH IN RT PYLON HAD TWO BROKEN WIRES. R & R THERMAL SWITCH IN RT PYLON IAW AMM 36-20-02, PERFORMED TEST OF SWITCH IAW AMM 36-20-02, TASK 36-20-02-700-801-A. TEST CHECKED GOOD. ACFT RETURNED TO SERVICE.