As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN CRUISE LOST CONTROL OF CABIN PRESSURIZATION. PASSENGER OXYGEN MASKS DEPLOYED AUTOMATICALLY. ACCOMPLISHED EMERGENCY DESCENT AND PRESSURIZATION CONTROL WAS REGAINED. MADE AN UNSCHEDULED LANDING AT PIT BECAUSE OF THE ADDITIONAL FUEL BURNED AT LOWER ALTITUDE. CHECK-C 6-29-01 STL. REPLACED THE AC OUTFLOW VALVE ACTUATOR BECAUSE ONE MOTOR ON THE ACTUATOR HAD A FAILED SIGNAL GENERATOR. ALSO REPLACED BOTH PRESSURIZATION CONTROLLERS PRECAUTIONARY