What was found
(CAN) DURING TAKEOFF WHEN POWER APPLIED PRESSURIZATION CONTROL WAS HUNTING FOR PROPER POSITION. DURING CLIMB-OUT CABIN WAS MAX CLIMB, CABIN ALT SHOWED 2,500 FEET. LEVELLED OFF AT 7,000 FEET BUT NO CONTROL OVER PRESSURIZATION SYSTEM. REPLACED NR 1 CABIN CONTROLLER AND OUTFLOW VALVE ACTUATOR. SYSTEM SERVICEABLE.