As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LGA - FLT 508 - EN ROUTE FROM CLT TO LGA - AT FL250, CAPTAIN REPORTED THE CABIN ALTITUDE WARNING HORN BEGAN SOUNDING. CREW DESCENDED AIRCRAFT TO FL100 AND CONTINUED ONTO LGA. MAXIMUM CABIN ALTITUDE WAS 9,5000 FEET. FLIGHT LANDED AT LGA WITHOUT FURTHER INCIDENT. MAINTENANCE REMOVED AND REPLACED THE LEFT PACK FLOW CONTROL VALVE. OPS CHECK GOOD. (M)