As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 6589 - IAD-BOS - DURING CRUISE, AIRCRAFT MADE AN UNSCHEDULED LANDING DUE TO RT PACK STUCK IN FULL HOT. AIRCRAFT LANDED AND WENT TO GATE WITH NO FURTHER PROBLEMS. MAINTENANCE INSPECTED AND REMOVED AND REPLACED ACM, OPS CHECK OK. AIRCRAFT WAS RELEASED AND APPROVED FOR RETURN TO SERVICE. (M)