As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER DEPARTING OKC, CREW REPORTED AIRCRAFT DEPRESSURIZATION AT FL 260. NO DOOR INDICATIONS. CREW WAS UNABLE TO CONTROL CABIN IN MANUAL OR AUTO. INSPECTED OUTFLOW VALVES. REMOVED DEBRIS. CLEANED OUTFLOW VALVES, REINSTALLED AND FUNCTIONALLY TESTED. PRESSURIZATION SYSTEMS LEAK AND FUNCTIONALLY TESTED GOOD. (M)