As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT ENGINE FIRE WARNING DURING TAXI OUT, A/C RETURNED TO GATE (BTB) AND MTX GROUNDED A/C. MTX TROUBLE SHOT AND REMOVED AND REPLACED AFT LOWER AND UPPER FIRE LOOPS ON #1 ENGINE AS PER AMM 26-11-02, SYSTEM CHECKS GOOD, GROUND ENGINE CHECKS GOOD, AIRCRAFT RELEASED NO ETOPS MTX RETURNED A/C TO SERVICE PN LOWER AFT 901907 SN 1608 TSI 36.0 TSO 36.0