As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX - DURING PRE-FLIGHT CHECK, FUOND THE FIRST CALSS EMERGENCY FLOOR TRACK ILGHTS ILLUMINATED WITH LIGHT SWITCH AND BATTERY ON AND OFF. COACH LIGHTS DID NOT ILLUMINATE. REPLACED BATTERY PACK AT B5-24. ALL LIGHTS THEN OPERATED PROPERLY. (M)