As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE TRYING TO COOL CABIN, CYCLED TRIM AIR SWITCH WITH NO EFFECT. CYCLED THE RECIRCULATION FAN SWITCH AND IMMEDIATELY STARTED LOOSING CABIN ATT. CABIN STARTED TO CLIMB TO 13K WHILE ON EMERGENCY DESCENT WENT MANUAL DECENT CABIN CONTROL CABIN TO 2K, PERFORMED SINGLE PACK PRESSURIZATION CONFIDENCE CHECK IAW AMM 21-51-00-755-602. RT PACK OPERATES NORMAL AT THIS TIME.