As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: UPON TAKEOFF THE COCKPIT AURAL SMOKE ALERT SOUNDED CONTINUOUSLY. NO SMOKE OR ANY EVIDENCE IN THE CABIN PUT THE NO PORTABLE ELECTRONIC DEVICES SWITCH IN THE ON POSITION ALERT WENT OFF. RESEATED SMOKE DETECTOR CONTROL UNIT (SDCU) AND PERFORMED BITE CHECK PER AMM 26-17-00 WITH NO FAULTS NOTED, SYSTEM OPERATIONAL CHECKS GOOD. NO FAULTS WERE FOUND ON THE LAST LEG REPORT.