GEHL RS8 PRIORITY VALVE ISSUE MAYBE?

I HAVE A ISSUE WITH A GEHL RS8-44 W/TRI-FUNCTION JOYSTICK AND PWP PACKAGE, NO OUTRIGGIERS. MY ISSUE IS THIS. WHEN YOU FEATHER THE BRAKE WHILE TRAVELING IT TAKES JOYSTICK HYDRAULIC PRESSURE AWAY UNTIL YOU RELEASE THE BRAKE PEDAL COMPLETELY OR STOP MACHINE COMPLETELY AND HOLD FIRM PRESSURE ON PEDAL. IT DOES HAVE A DECLUTCH SWITCH BUT MAKES NO DIFFERENCE IF ITS ON OR OFF STILL DOES IT. IM INCLUDING SOME HYDRAULIC SCHEMATIC PICS OF SUSPECTED FAULTY VALVE(S) ANY HELP WOULD BE GREATLY APPRECIATED. ALSO MACHINE HAS WIRELESS REMOTE PACKAGE NOT IN SCHEMATIC SERIAL# RS844JE1117462