As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PHL-PBI - FLT 1930, AT 17,000 FEET THE PRESSURIZATION FLOW LIGHT ILLUMINTED. THE CABIN WAS CLIMBING AT 500-600 FPM WITH THE OUTFLOW VALVE COMPLETELY CLOSED IN BOTH AUTO AND MANUAL. THE ENGINES WERE SET AT CRUISE POWER (.15) EPR. THE AIRCRAFT RETURNED TO THE FIELD AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED THE FLEX SLEEVE IN THE RIGHT PACK TEMP CONTROL VALVE SUPPLY LINES. (M)