As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT#778, LAS-BOS. (ETOPS) 'MX AIR BLEED MSG ( 36-00-00-C CLASS II MAINTENANCE MESSAGES DISPLAYED ON ECAM STATUS PAGE OF ECAM SYSTEM DISPLAY FAULT(S) INDICATED BY AIR BLEED ); PFR FAULTED RELAY-APUBV CMND(21HV,22HV) REMOVED AND REPLACED AIR BLEED/ APU BLEED VLV CTL RELAY FOR BMC 1 AND 2 IAW AMM 36-12-00. OPS CHECK OF BMC 1 AND 2 GOOD. THIS CLEARS MDDR 534707. MX-4 UPDATED. PLACARD REMOVED.