As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AFTER COMPLETION OF PUSH BACK WE HAVE SMOKE WARNING CHECK FIRE DETECTED WARNING LIGHT IN AFT BAGGAGE, WE CAME BACK TO APRON. AFTER SMOKE WARNING FIRE EXTINGUISHER OPERATED. BOTH HRD & LRD BOTTLES DISCHARGED. MAINTENANCE REPLACED CONTROL AMPLIFIER.