I'm having a similar problem. When the PTO switch is pulled up to engage clutch, the clutch will make noise as long as the pto switch is pulled up,
but not fully engage. Sometimes I could kick a pulley on the deck and the blades would engage. Now the clutch just makes noise. Checked all fuses, pulled the switch and checked wires and connections all look ok on the switch. Not sure if this would be the same as on this thread or not.