As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
L BLEED DUCT WARNING MSG, CABIN ALT WARNING CURRENTLY OUT OF SERVICE AND TEROUBLESHOOTING. THE CABIN ALT WARNING WAS A DIRECT RESULT OF THE BLEED VALVES CLOSING AFTER THE MESSAGE PERSISTED FOR MORE THAN 30 SECONDS WITHOUT A CONFIGURATION CHANGE PER THE QRH. ALL MASKS DROPPED.