As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT#2260, MAD-BOS. (ETOPS) "AVIONICS SYS FAULT - SKIN AIR OUTLET VALVE ( SKIN AIR OUTLET VALVE (AVIONICS) ); REMOVED AND REPLACED SKIN AIR OUTLET VALVE (22HQ) IAW AMM 21-26-53 OPS CHK OK NO FAULTS NOTED AT THIS TIME A/C OK FOR SVC MDDR CLEARED PLACARD REMOVED MX4 UPDATED.