What was found
DURING CLIMB, CABIN WOULD NOT PRESSURIZE. FLIGHT RETURNED TO SEA. MAINTENANCE REPLACED THE CABIN DIFFERENTIAL PRESSURE INDICATOR, OPERATIONAL CHECK OK.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
DURING CLIMB, CABIN WOULD NOT PRESSURIZE. FLIGHT RETURNED TO SEA. MAINTENANCE REPLACED THE CABIN DIFFERENTIAL PRESSURE INDICATOR, OPERATIONAL CHECK OK.