As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAH - RETURN FROM FLIGHT - UPON CLIMB-OUT, FOUND CABIN PRESSURIZATION UNCONTROLLABLE IN AUTO AND STANDBY. SWITCHED MANUAL DC. CABIN RATE NOT CONTROLLABLE. SHUT OFF ONE PACK. CABIN STARTED TO RISE UNCONTROLLABLE. CLOSED CARGO HEAT OUTFLOW VALVE. CABIN STARTED TO DESCEND ON DESCENT. ON POST-FLIGHT INSPECTION, FOUND STATIC FITTING ON CABIN PRESSURE CONTROLLER TO BE LOOSE. TIGHTENED. OPS CHECK IAW MM 21-30-00 NORMAL. (X)