As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERGENCY DECLARED. RETURNED TO DEPARTURE DUE TO A LEFT ENGINE WARNING INDICATIONS FOR FIRE LOOP, N2, AND CENTER FUEL BOOST PUMP. AIRCRAFT WAS GROUNDED. MAINTENANCE DETERMINED DIFFICULTY WAS THE PNEUMATIC DUCT CLAMP FAILED. REMOVED AND REPLACED THE CLAMP IAW AMM 36-11-01. OPS CHECKED GOOD.