What was found
AIRCRAFT WAS NOT GNDED. EMER DECLARED, LANDING UNEVENTFUL & ACFT NOT OVERWEIGHT. DURING APPROACH, AT 25,000 FEET, AUTO PRESSURIZATION CONTROLLER NR 1 BECAME INOPERATIVE. SWITCHED TO NR 2 & CABIN ALTITUDE WENT TO SEA LEVEL. R & R THE OUTFLOW ACTUATOR IAW AMM 32-21-05. ACCOMPLISHED BITE CHECK IAW AMM 21-32-00-201 WITH NO FAULTS FOUND.