2005 Deere 755C Series 2 Dozer Steering Control Issue

We have a 2005 John Deere (manufactured by Lieberr) 755C Series 2 Dozer that was shorted out while changing the alternator. A wrench connected to the hot lead touched the body panel and within an instant fried the cables. The machine was not switched on at the time this happened. Now, everything operates normally except for the steering control. The machine starts, hydraulics work fine but as soon as we try to move the machine, there is a tick like a safety switch was flipped and the machine doesn't move. All fuses have been checked and only the alternator fuse blew. Two technicians have come to look at it without any luck. The technicians have been unable to connect their diagnostics due to them not having the correct plug. They suggested to replace the foot pedal steering control computer, but at $10,000, I would like to do more investigating rather than spend that money on their guesswork. Apparently, John Deere and Lieberr are having a conflict and Lieberr technicians cannot access John Deere's schematics. Two dealiers have told my stepdad several stories about why they cannot properly diagnose the issue and to me, it sounds like a really expensive runaround. Any advice? If the computer was fried, I would assume other issues with the machine would arise as it moves through its safety checks during startup.