As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT ENGINE DUCT LIGHT ILLUMINATED DURING CLIMB-OUT. RETURNED TO PSP. REMOVED PANELS, TIGHTENED CLAMP ON HEAT EXCHANGER. REPLACED BOTH SENSORS IN LEFT PACK AREA. RAN ENGINES AND APU. NO DUCT LEAK LIGHT AT THIS TIME. INSTALLED ALL REMOVED PANELS.