As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PACK 2 OVERHEAT WITH STRONG BURNING SMELL WHEN THRUST LEVERS AT HIGH SETTING. C/W FIM TASK 21-51-00-810-804-A BLOCK 2 RESULT IN NO PACK 2 OVERHEAT EICAS MESSAGE. NO RESULT BLOCK II TRANSITORY CONDITION OF AIR CONDITIONING SYSTEM. FOUND WON AND LEAKING SLEEVE AT NR 2 PACK VALVE Y DUCT, REPLACED SLEEVE. SYSTEM OPERATIONS CHECK GOOD, OK FOR SERVICE.