As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER STARTING ENGINES, CHECKED MC LIGHT AND GOT RIGHT PACK LIGHT. REMOVED AND REPLACED RIGHT PACK TEMP CONTROL VALVE REF MM 21 61 00, OP CHECK AND BITE CHECK GOOD REF MM 21 61 20. GROUND VERIFICATION ACCOMPLISHED PER ETOPS MANUAL. RT PACK TEMP CONTROL VALVE VERIFIED BY SEAMC.