What was found
CREW REPORTED BRIEF EICAS MESSAGE BLEED NR 2 OVERTEMP, ILLUMINATED AND CLEARED. FOLLOWED BY EICAS MESSAGE PACK NR 2 CLOSED AND BLEED NR 2 CLOSED AFTER RESETTING BOTH BLEED AND PACK NR 2 STRONG BURNING ODOR OCCURRED. MX INSPECTED AND FOUND NR 1 PACK SEIZED AND PLACED ON MEL 21-51-00-3 CAT "C". MX ALSO FOUND DUCT ON NR 2 DUAL TEMP CONTROL VALVE BLOWN OFF AND R & R DUCT. PERFORMED AIR BLEED SYS TEST IAW EC3610-01075 AND AMM 36-00-00 AND COULD NOT DUPLICATE BLEED NR 2 OVERTEMP. PERFORMED HIGH POWER ENGINE RUNS IAW MM 72-00-00 AND COULD NOT DUPLICATE ODOR. ACFT WAS APPROVED FOR RETURN TO SERVICE.