As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN CRUISE AT FL340, CABIN ALT BEGAN TO DECREASE. DESCENDED TO FL240 AND CABIN CONTINUED TO DESCEND RAPIDLY. CABIN ALTITUDE REACHED 16,000 FT AND PAX O2 MASKS DROPPED. DIVERTED TO GJT. REPLACED LT PACK SUPPLY DUCT. OPERATIONAL CHECK NORMAL IAW MM 21-31-16-710-801, 21-51-13, 21-51-00-710-801.