As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PACK 2 OVERHEAT DISPLAYED ON EICAS DURING TAKE OFF, AIR COND PACK N650 AND ABOVE AMENDED. R & R PACK 2 OVERTEMP SWITCH, TEMP SENSOR, AND CONDENSOR MIXER. RAN ENGINES AT POWER WITH BLEEDS AND PACKS ON. NO PACK 2 OVHT MESSAGE DISPLAYED AT THIS TIME. R/R #2 PACK VALVE IAW AMM 21-51-01-000/400-801-A. PERFORMED OPS CHECK AT HIGH POWER IAW AMM TASK 21-51-00-700-801-A. NO OVERHEAT MESSAGE SHOWN AT THIS TIME.