What was found
TWO HOURS INTO FLIGHT, HAD A QUICK FLASH ALERT LEVEL 2 FOR THE NR 2 ENGINE FIRE LOOP A, LASTED ONE SECOND AND WENT AWAY. 15 MINUTES LATER HAD STEADY LEVEL 2 ALERT FOR LOOP B. RAN QRH CHECKLIST, LOOP A TESTED GOOD. OPERATED IN LOOP A AT THAT POINT. ALL OTHER ENGINE INDICATIONS LOOKED NORMAL. NOT USING NR 2 PACK SO CLOSED THE NR 2 ENGINE BLEED AIR SWITCH AS A PRECAUTION. 10 MINUTES LATER RECEIVED A NR 2 ENGINE FIRE WARNING. RAN THE ENGINE FIRE CHECKLIST, SHUT DOWN THE NR 2 ENGINE, USED BOTH FIRE BOTTLES, FIRE WARNING REMAINED ON DIVERTED. R2D 9TH STAGE COOLING DUCT IAW AMM 70-00-00-2.