What was found
AIRCRAFT FAILED TO PRESSURIZE AFTER TAKEOFF. FLIGHT RETURNED TO DTW AND LANDED WITHOUT INCIDENT. REPLACED OUTFLOW VALVE ACTUATOR. OPERATIONAL CHECK OK, AIRCRAFT RETURNED TO SERVICE.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
AIRCRAFT FAILED TO PRESSURIZE AFTER TAKEOFF. FLIGHT RETURNED TO DTW AND LANDED WITHOUT INCIDENT. REPLACED OUTFLOW VALVE ACTUATOR. OPERATIONAL CHECK OK, AIRCRAFT RETURNED TO SERVICE.