As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING STUDENTS STALL PRACTICE THE WARNING HORN FAILED TO OPERATE THROUGH FULL STALL, CFI HALTED MANEUVER. TROUBLESHOOTING CONFIRMED THAT WARNING HORN ASSY, PN 07133481 WAS DEFECTIVE. UNIT WAS REPLACED WITH NEW. THIS IS THE 7TH HORN REPLACED IN THIS FLIGHT SCHOOL IN CAUSE IS THE CHEAP GRADE OF PLASTIC USED TO MFG THE REED IN THIS ITEM.