As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 3080, SDF TO LGA - WHILE CLIMBING THROUGH FL130 THE CREW RECEIVED AN AMBER CAB ALT MESSAGE ON EICAS, AND RETURNED TO SDF. THE MANUAL PRESSURIZATION SYSTEM OPERATED NORMALLY WHEN TESTED AND THE AUTO SYSTEM WAS DEFERRED. THE AUTO SYSTEM DEFERRAL WAS CLEARED IN SDF ON 4/3/2009 WHEN THE CPAM WAS REPLACED AND THE AUTO SYSTEM OPERATED NORMALLY.