What was found
DURING CLIMB, THE AIRCRAFT DID NOT PRESSURIZE IN AUTO MODE. AIRCRAFT DID PRESSURIZE IN MANUAL MODE. AIRCRAFT RETURNED TO DTW AND LANDED WITHOUT INCIDENT. REPLACED THE CABIN PRESSURE AMPLIFIER. OPERATIONAL CHECK GOOD.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
DURING CLIMB, THE AIRCRAFT DID NOT PRESSURIZE IN AUTO MODE. AIRCRAFT DID PRESSURIZE IN MANUAL MODE. AIRCRAFT RETURNED TO DTW AND LANDED WITHOUT INCIDENT. REPLACED THE CABIN PRESSURE AMPLIFIER. OPERATIONAL CHECK GOOD.