What was found
ENGINE NR 1 IN FLIGHT FIRE WARNING. COMPLIED WITH ALL CHECK LISTS, ENGINE SHUTDOWN AT 1650Z. FOUND B-NUT UNSCREWED ON I/B CASCADE, RESECURED. LOWER FIRE LOOP CONNECTOR FULL OF ENGINE OIL, CLEANED CONNECTOR AND REINSTALLED IAW MM. GROUND RAN ENGINE FOR SEVERAL MINUTES IAW MM, GROUND OPS CHECKS GOOD.