As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MIA-LIM - FLT 917 - DURING CLIMB-OUT, UNABLE TO CONTROL CABIN PRESSURIZATION OR OUTFLOW VALVE. AIRCRAFT RETURNED TO MIA AND LANDED WITHOUT INCIDENT. FOUND INSULATION BLOCKING OUTFLOW VALVE AND CLOGGING SCREEN. CLEARED INSULATION AND REPLACED OUTFLOW VALVE. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)