As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AVIONICS SMOKE CAUTION LIGHT ILLUMINATED INTERMITTENTLY DURING PREFLIGHT. NO ACTUAL SMOKE, FUMES OR ODORS WERE DETECTED. MAINTENACE REPLACED AVIONICS SMOKE DETECTOR P/N 72-111211-000, S/N OFF A5331, S/N ON A5322. ALL CHECKS GOOD AT THIS TIME IAW SF340 NR 26.