What was found
PIT/TPA - FLT 1845 - WHILE CRUISING AT 35,000 FEET, THE CABIN ALTITUDE SLOWLY CLIMBED TO 10,000. AFTER CREW WAS UNABLE TO CONTROL THE CABIN ALTITUDE MANUALLY, AN EMERGENCY DESCENT WAS INITIATED AND THE AIRCRAFT DIVERTED TO CLT AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED THE CABIN PRESSURE OUTFLOW VALVE ACTUATOR. (X)