As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT#523, JFK-LAX. (ETOPS) 'CLASS II MX MSG AIR BLEED ( 36-00-00-C CLASS II MAINTENANCE MESSAGES DISPLAYED ON ECAM STATUS PAGE OF ECAM SYSTEM DISPLAY FAULT(S) INDICATED BY AIR BLEED );IDLE ENGINES IAW AMM 71-00-00. NO MSG ON ECAM. MX-4 UPDATED. MDDR CLEAR.