Has anyone else had problems with pressurization issues. I have tried everything to get the plane to pressurize. I have packs on, app air on. I've also tried all engine switches on and app air off, im also in auto. But I can never pressurize. Cabin air is always the same as altitude. Also outflow switch is normal, but the outflow valves are always open. As the green lights are one. Am I missing something? Thanks