As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THIS NEWLY OVERHAULED DETECTOR WAS INSTALLED AND OPS CHECKED AFTER A COUPLE OF CHECKS THE STALL HORN WILL STAY ON. RETURNED UNIT FOR ANOTHER O/HED DETECTOR. THIS ABOUT SECOND AIRCRAFT I WENT THROUGH THIS WITH (ORDERING DETECTORS UNTIL I GET ONE THAT WORKED. NEED BETTER QC).