What was found
LMP FLIGHT NR 2011 LEVELING AT 25000 FEET WE GOT A CABIN PRESS WARNING. CABIN ALT 12,000 FEET (FORWARD OUTFLOW WAS NORMAL, BLEEDS WERE ON AND MAX AND THE CABIN DUMP SELECTOR WAS IN AUTO) DECLARED THE EMERGENCY STARTED AND RAN ALL CHECKLISTS TO THEIR COMPLETION IN A 3500 FT DESCENT RATE THE CABIN ALTITUDE DESCENDED TO BELOW 10,000 FEET. LEVELED AT 9500 FEET AND CABIN ALT LEVELED AT AROUND 6000-65000 DIFFERENTIAL WAS AROUND 1.0 - 1.5 DIFF. EVERYTHING APPEARED TO BE NORMAL FOR THE REST OF THE FLIGHT. MAINTENANCE COMPLIED WITH VISUAL INSPECTION OF FORWARD AND AFT OUTFLOW VALVES WITH NO DEFECTS NOTED. REPLACED CABIN PRESSURE CONTROLLER IAW MM TASKS 21-30-069-000-801 AND 21-30-09-400-801. GROUND RAN AIRCRAFT, PRESSU