As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED A RIGHT PACK OVERPRESSURE AFTER TAKEOFF FROM DAY. CREW RETURNED TO DAY AND LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED, FOUND THE RIGHT PACK ICED UP AND RAN THE RIGHT PACK AT A WARMER TEMPERATURE TO THAW. MAINTENANCE PERFORMED CHECKS USING THE AIRCRAFT MAINTENANCE MANUAL. AIRCRAFT WAS RELEASED FOR SERVICE.