What was found
KDAY/KDFW - FLT 022 - ON DESCENT INTO KDFW, GIT A FIRE WARNING ON NR 2 ENGINE. PULLED THROTTLE BACK TO FLIGHT IDLE, LIGHT WENT OUT, BUT BELL WOULD NOT TEST. SHUT ENGINE DOWN ON DESCENT. KDFW MAINTENANCE REPLACED NR 2 LOWER FIRE LOOP. LEAK CHECKED ALL PNEUMATIC DUCTS AND LINES FOR LEAKS. CHECKED ENGINE FOR CRACKS. FOUND LOWER LOOP DAMAGED BY ENGINE COWL-LOOP WOULD SHORT WHEN FLEXED. SYSTEM OPS CHECKED GOOD.