As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LOWER AFT BODY HEAT LIGHT ILLUMINATED ON CLIMBOUT. LIGHT OUT WITH NR 1 THROTTLE AT IDLE AND LEFT PACK OFF. LEFT DUCT PRESSURE SHOWS 10 PSI. FOUND KEEL BEAM LOOP RESISTANCE OUT OF LIMITS. REPLACED KEEL BEAM LOOP AND TESTED PER MM, TESTED NORMAL.