As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX- MASTER WARNING LIGHT AND SMOKE WARNING LIGHTS ILLUMINATED IN FLIGHT. PUSHED OFF MASTER WARNING LIGHT AND SMOKE WARNING EXTINGUISHED. NO SMOKE VISIBLE OR ODOR DETECTED. INSPECTED SMOKE DETECTORS. NO DEFECTS NOTED. COMPLIED WITH OPERATIONAL TEST OF SMOKE DETECTORS IAW DHC-8 AMM 26-15-00-710-801. OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE. NO PARTS REPLACED.