As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ETOPS SIGNIFICANT SYS, LT PACK INOP LIGHT ILLUM EICAS MSG L PACK TEMP DISPLAYED OPERATED NORMAL AFTER STBY SELECTED. T/S IAW FIM 21-51-00 FIG 103 FAULTED TEMP CONT VALVE T/S IAW TABLE 23, SHEET 2 ALSO CLEANED TEMP CONT VALVE CONNECTOR PLUGS. VALVE VERIFIED OPERATION OPENS AND CLOSES AND OPERATES NORMAL RAN PACK 45 MIN NO FAULTS OR MESSAGES OK FOR SERVICE.