As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AT FLT LEVEL 230, A/S 250K, FLAPS 0, CRUSE. EXPERIENCED MOD TURB OVERSPEED HORN WENT OFF MOMENTARILY UNDETERMINED AMOUNT OF TIME. CREW DECLARED A MEDICAL EMERGENCY. MAINTENANCE ACTION, INSPECTION AFTER OPERATING AT MORE THAN MAXIMUM OPERATING SPEED VMO PLUS 6 KNOTS CONDITION 3 CARRIED OUT IAW AMM 05-50-28-210-801. AIRCRAFT CHECK AND NO FAULT FOUND.