What was found
LEVEL 3 "AIR MANF 2 FAIL" AIR SYNOPTIC DISPLAYED RED LINE FROM ENG 2 TO PACK 2 FOLLOWED QRH WITH NR 2 ENG AT IDLE THE SYNOPTIC LINE TURNED AMBER, PACK 2 OFF DISPLAYED AND REMAINED OFF. DIVERTED, EMERGENCY DECLARED. FAULT REVIEW, UPPER TAIL POD B SHORT. R & R THE SENSORS AND FMC. ENGINE POWER RUN PERFORMED. SYSTEM WORKS NORMAL. D1-122 OFF, PN 356325-4-255, SN UNK D1-126, PN OFF 35551-4-310, S/N UNK.