As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT DEPARTED BQN EN ROUTE TO GSO, CREW EXPERIENCED DIFFICULTY WITH CABIN PRESSURIZATION. C/B 3X14 PULLED AND RESET TO NO AVAIL. AIRCRAFT RETURNED TO BQN. LANDING NORMAL. AFT OUTFLOW VALVE OK IN ALL MODES, FORWARD VALVE INOP IN ALL MODES. T/S PER 21-50-00. REMOVED AND REPLACED CABIN PRESSURE CONTROLLER. OPS CHECKED OK. AIRCRAFT RETURNED TO SERVICE. (M)