What was found
ON DESCENT INTO MSP, RT ENGINE FIRE ILLUMINATED WITH FIRE BELL FOR 1-2 SECONDS. NO MASTER CAUTION OR T-HANDLE LIGHT. MAINTENANCE PERFORMED OPS CHECK OF FIRE DETECTION SYSTEM IAW AMM 25-1-00-2 PARA 2A, OPS CHECK GOOD. PERFORMED VIS INSPECTION OF RT NACELLE FIRE LOOP, NO DISCREPANCIES NOTED. REPLACED WEU IAW 31-50-05-4, ALL CHECKS GOOD.