What was found
NR 2 ENGINE FIRE DETECTOR ILLUMINATED FOLLOWED BY RT ENGINE FIRE WARNING. PERFORMED QRH PROCEDURE, DISCHARGED NR 2 ENGINE. PERFORMED VISUAL CHECK. ALL EXTERNAL VISUAL CHECK NORMAL. NO ABNORMAL ENGINE INDICATIONS PRIOR TO FIRE WARNINGS. MX FOUND LOWER FAN ACCESSORY ZONE FIRE DETECTOR CHAFED FROM COWL OPEN ROD. REPLACED A/B LOOP ASSEMBLY IAW AMM. TESTED GOOD. REPOSITIONED COWL OPEN ROD AND R & R NR 2 FIRE BOTTLE IAW AMM. ENGINE CHECKS GOOD.