As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU FIRE LIGHT ILLUMINATED DURING APU START. QRH PROCEDURE ACCOMPLISHED, AGENT DISCHARGED, LIGHT EXTINGUISHED AFTER APPROXIMATELY 15 TO 20 SECONDS. REMOVED AND REPLACED APU FIRE BOTTLE IAW R6D26001 AND APU FIRE LOOP ELEMENT, OPS CHECKED GOOD.