As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LAS INFLIGHT T2274/25JUL - LEFT ENGINE FIRE WARNING ILLUMINATED. REDUCED NUMBER ONE ENGINE TO IDLE AND WARNING INDICATION WENT OUT. LANDED LAS WITHOUT INCIDENT. REPLACED NUMBER ONE ENGINE ON 26 JUL AT LAS DUE TO AIR DUCT LEAK AT 13TH STAGE MANIFOLD. SYSTEM GROUND CHECKED NORMAL OPERATION.