As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFT CARGO BAY SMOKE DETECTOR WENT OFF WITH ASSOICATED SMOKE WARNING WHILE ACFT WAS PARKED ON THE GROUND. NO EVIDENCE OF FIRE OR SMOKE. FOUND THE DETECTORS COVERED IN DUST DUE TO DUST STORM. CLEANED THE DETECTORS AND C/W OPS TEST IAW AMM 26-12-06. CHECKS GOOD. RETURNED TO SERVICE.