As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ETOPS SIGNIFICANT SYS - BTB - ON TAXI EICAS DISPLAY CABIN AUTO INOP. LWR EICAS STATUS CABIN ALT AUTO 1 AT CABIN ALT AUTO 1. BOTH SYS CONTROLLERS INOP. CABIN WENT TO MAX DIFF, CABIN ALSO VERY HOT 90 DEG F. WENT TO MANUAL. PERFORMED FIM 21-31-00 FIG 104. REMOVED AND REPLACED OUT FLOW VALVE AC MOTOR NBR 2. IAW AMM 21-31-05. OPS CHECK OK. OK FOR SERVICE.