As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AC DEPARTED AND CLIMBED TO 3000 FT MSL. NR1 ENG FIRE WARNING HORN AND LIGHT ACTIVATED. AC DECLARED EMERGENCY AND RETURNED TO DEPARTURE. MAINT FOUND NO EVIDENCE OF FIRE. DISCOVERED NR1 FIRE LOOP SHORTED OUT. REPOSITIONED AND TESTED FIRES SYS WARNING. OPS CHECK SYS IS NORMAL. (A)