As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT#455, BOS-JFK. 'INFLIGHT (WHILE ALREADY OPERATING W/MEL 36-00-00A) XBLEED FAIL EICAS MESSAGE PRESENTED AND AMBER X WAS DISPLAYED ON ECS SYNOPTICS PAGE; FOLLOWING FIM TASK 36-10-00-810-801-A00 FOUND AMS CH2 TO ERRONEOUSLY SHOW XBLEED VALVE X'D OUT. RESET AMS CONTROLLERS CH1&2 & RAN BOTH ENGINES & CYC XBLEED NUMEROUS TIMES W/O APU BLEED & W/APU BLEED NO FAULTS NO CMC MSG'S OK FOR CONT'D SVC. ENG RUNS AMM 71-00-00.'