As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LIM/MIA - NR 4 ENGINE FIRE LIGHT CAME ON CLIMBING THROUGH 20.0. BOTH A/B LOOPS WERE AT 9.0. FIRE SWITCH PULLED. FIRE BOTTLE WAS NOT FIRED. HYDRAULIC PUMP NR 4 IN SUPPLY OFF POSITION OR 1 PLUS 30 MINUTES. PERFORMED NACELLE OVERTEMPERATURE INSPECTION ON NR 4 ENGINE. FOUND LOOSE CLAMP ON 8TH STAGE DUCT. SECURED AS REQUIRED. RAN NR 4 ENGINE. OPS CHECK NORMAL IAW 71-00-00. (M)