What was found
LT ENGINE FIRE INDICATION WARNING, ON DEPARTURE FROM DTW RECEIVED LT ENGINE FIRE WARNING INTERMITTENTLY. SHUTDOWN LT ENGINE, ORH COMPLETED. FIRE WARNING DID NOT RECUR AFTER SHUTDOWN, LANDING WEIGHT WAS 26,700 LBS. AIR RETURN TO DTW. MAINTENANCE FOUND LT FIRE LOOP P/N 899253. CHAFING, SEE 409 NR 13289 FOR DETAILS. ALL RUNS GOOD.