As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PHX - AIR TURNBACK - FLT 803 - C - DURING CLIMBOUT OF PHX TO SFO, THE NR 1 ENG FIRE LIGHT AT THE START SWITCH AND OVERHEAD INDICATION CAME ON TWICE, (NO ECAM INDICATION OR CRC). THE AIRCRAFT WAS RETURNED TO PHX MAKING AN UNEVENTFUL LANDING. MAINTENANCE TROUBLESHOT PER TSM 26-12-00-810 AND REPLACED ANNUNCIATOR LIGHT INTERFACE BOARDS 5LP & 18LP PER AMM 33-14-33. INDICATIONS AND OPERATIONAL TESTS WERE NORMAL. (NOTE: 2 BOARDS WERE REPLACED, SAME P/N).