As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 3 ENG FIRE WARNING. COMPLETED CHECK LIST LIGHT REMAINED ON. PERFORMED NR 3 ENG RUN PER JRH 11.1 ALL SYSTEMS OPERATE NORMALLY. NO LEAKS NOTED SYS B-LOOP CHECKS NORMAL. LOOP-A CAUSES INTERMITTENT FALSE WARNINGS. PLACED A-LOOP ON DMI 32839 PER MEL 26-2-3 CAT C DDD 6/18/08. PLACARDS INSTALLED. FLIGHT 560. AIRCRAFT WAS GROUNDED. (A)