Hello, a few questions:
1. When attempting to travel do any of the contactors try and close?
2. How do the tips of the A1 contactor look? There shouldn't be lots of black marks or pitting.
3. When stepping on the brake pedal does the brake on the motor fully release?
4. Do the hydraulic functions still work?
5. If you remove Fuse 1 how does it test? It should be no higher than 0.3hms.

With these older machines the travel functions in the handle are on the same circuit as the brake and presence pedal switches. If one of these switches does not close, then the controller will never get an input. I've seen it happen where there isn't enough brake pressure in the lines so the brake never opens even when the operator is on the pedal.

Typically if a contactor is bad it will either become welded closed or close and immediately open back up. If it is either of these, the contactor tips need to be replaced.

Hopefully this helps you down the right path!