As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AT FLIGHT LEVEL 350 FLOW LIGHT CAME ON. DESCENT INITIATED, LIGHT WOULD GO OFF AND ON. AT FLIGHT LEVEL 290 LIGHT CAME ON AND CABIN STARTED TO CLIMB AT MAX RATE. EMERGENCY DESCENT INITIATED AND CABIN CONTROL REGAINED JUST BELOW 20,000 FEET. MAINTENANCE CARRIED OUT BITE TEST ON #1 CONTROLLER. #1 CABIN PRESSURE CONTROLLER CHANGED.