As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AUTO PRESSURIZATION FAILURE. TWO TAKEOFFS, TWO OCCURRENCES. FOUND INSULATION HOLDING THE CABIN SAFETY RELIEF VALVE OPEN. IN ADDITION LEAK FROM CLAMP ON LEFT PACK FLOW CONTROL VALVE WHICH WAS REPLACED EARLIER. REPLACED RELIEF VALVE AND CLAMP. PERFORMED OPERATIONAL CHECK OF THE SYSTEM GOOD. NO LEAK FOUND AND NO MORE DISCREPANCIES REPORTED.