As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT (AT FL 290) CABIN ALT STARTED TO CLIMB. DESCENDED TO F200, THEN FL 160 DOWN TO 10,000 DIVERTED TO OKC. REMOVED AND REPLACED RT PACK VALVE REF MM 21-55-71, NO HELP. PROBLEM VERIFIED RT PACK SWITCH. REMOVED AND REPLACED RT PACK SWITCH. OPERATIONAL CHECK REF MM 21-55-00 OK. PERFORMED PRESS CHECK REF MM 05-51-101. SYSTEM TESTS GOOD.