I am in desperate need of assistance. Have a GEHL 5640 Turbo. Has auxiliary function guillotine. On one side of hydraulic supply, have a constant 1500 PSI on one line, whether trying either rocker button. Guillotine stays open. Pump dead heads when requesting any aux functions. Have all other functions, drive, bucket lift and tilt. Manually bled guillotine to close, raising normally. Replaced both quick disconnects. Recalibrated aux roller button, still no close function. Replaced both solenoids on manifold, same problem. I am in Houston, Texas and contacted local dealer, and he has on ideas. Please help, looks like it my be something in manifold.