Hiya. My 6310 had been parked up for a while. I started it today and i immediately have no brakes steering or spool valves. Linkage will only raise really slow if i rev it hard. The linkage has been tempermental for some time. It jumps and sometimes wont raise or lower. Sometimes it would only lower if i stand on tje arms and press the mudguard button and then it would be really slow. I'd also noticed if i lock a spool valve in for the post knocker it wont raise the arms whilst its in even though I'm not operating any function on the knocker. Ive had the stepper motor checked and thats good. I'd be grateful for any help thanks.