As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING CLIMB, THE AVIONICS RACK SMOKE WARNING LIGHT CAME ON. NO INDICATION OF FIRE OR SMOKE IN AVIONICS RACK. SUBSEQUENT INVESTIGATION REVEALED NO REASON EXCEPT THAT AVIONICS RACK WAS EXTREMELY DUSTY AND THE DUST COULD HAVE ACTIVATED THE WARNING SENSOR. SENSOR REPLACED.