As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DUCT LEAK LIGHT ILLUMINATED IN FLIGHT. FOLLOWED QRH INSTRUCTIONS AND DUCT LEAK LIGHT EXTINGUISHED. RETURNED TO LAX. REPOSITIONED CLAMP AT HEAT EXCHANGER INLET. RAN LEFT ENGINE AT MAXIMUM RPM IN AUTO/NORM WITH BLEED AND PACKS ON. OPS CHECKS GOOD AT THIS TIME.