As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT LOST PRESSURIZATION AT FL280. CABIN ALTITUDE WENT TO 16,000 FT AND MASKS DEPLOYED. REPORTS OF SMOKE IN CABIN WERE UNFOUNDED, POSSIBLE CONDENSATION DUE TO RAPID DECOMPRESSION. FLIGHT DIVERTED TO YYZ AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED A DIRTY CABIN TEMPERATURE ANTICIPATOR. AIRCRAFT RETURNED TO SERVICE.