As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EN ROUTE AT 11500 FT, RECEIVED A 'CABIN ALT' LIGHT ON THE MAP WITH MASTER WARNING AND TRIPLE CHIME. QRH PROCEDURE FOLLOWED, UNABLE TO CONTROL CABIN PRESSURE IN MANUAL MODE. RETURNED TO SBA. REPLACED PRESSURE CONTROLLER. PRESSURIZED AIRCRAFT, OPS CHECK GOOD.