As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ETOPS SIGNIFICANT SYS - R PACK LIGHT ILLUM. EICAS MSG R PACK TEMP DISPLAYED, OPERATED NORM AFTER STBY SELECTED. TROUBLSHOT IAW FIM 21-51-00/101 BIT AND PREVIOUS FOUND FAULTS ON CONTROLLER FAULT "TEMP CONT VLV" PERFORMED STEPS OF FIG 103 SH 5. VERIFIED FAULT DID NOT RETURN. IAW FIM TEMP CONT VALVE IS OK.