As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CARGO SMOKE ANNUN ILLUMINATED SIX MINUTES AFTER TAKEOFF AROUND 6000 FEET. ILLUMINATED INTERMITTENTLY FOUR TIMES THEN REMAINED OFF FOR THE REMAINING TRIP BACK TO DTW. MAINTENANCE REPLACED WEU. ALL WORK DONE IAW SAAB 340 MM. ALL CHECKS GOOD.