As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AMA - INFLIGHT COS-DFW. CREW REPORTED LEFT PNEUMATIC SYSTEM PRESSURE RUNNING EXTREMELY HIGH AND WAS UNCONTROLLABLE. FLIGHT DIVERTED AMA LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. FLIGHT WAS FERRIED TO DFW FOR MAINTENANCE. REPLACED LEFT AUGMENTATION VALVE THAT HAD FAILED. SYSTEM GROUND CHECKED NORMAL OPERATION.