Will not shift out of 1st

I have a book on the 727 and these are the things it says when there is no upshift:

- Fluid too low
- Throttle linkage adjustment
- Kickdown band adjustment
- line pressure too high or low
- Governor malfunction or sealing rings
- Valve body malfunction
- Sticking accumulator, broken accumulator, rings, etc
- Malfunctioning clutch or servo
- Oil pump malfunction
- front clutch worn or malfunctioning
- broken input shaft or reaction shaft rings
- shift lever adjustment

My 904 doesn't go into 3rd so trying to see if it needs a rebuild or if an adjustment/ service would fix this.