2011 Navistar 7500 VIN: 1HTWNAZTSCJ549743 Maxx Force 10 When driving this truck it would lock up into forward gear, the driver believed it to be 4th gear. It would not up ship or down shift or go into reverse. It has an active pressure 1 (PS1) code. Dropped the valve body, the fluids and filters look good. Changed the switch and the same issue persist. Any recommendations or testing procedures would be appreciated
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