The lift I am working on has SAS and no active codes, even when the backward tilt doesn't work. The lift does have the leveling button on the tilt handle. The hydraulic fluid is full. No other hydraulic issues are present, the forks will lift, lower, side shift and tilt forward just fine. The backward tilt wasn't working for a few days and then today when I started the engine, it began to work, then stopped. I would tilt forward and try it again and it worked again. It has been working fine so far, but instead of allowing our warehouse to use the lift, I would like to know what is causing the intermittent issue. I'm not sure if it is hydraulic or if there is an issue with the solenoids/valves, or if it is electrical. Any insight would be appreciated.