I have recently bought a l2002dt grey market. Been going great no drama's...till today. I took my 4th slasher off to clean it up and upon reattaching it the slasher will not stay up once the tractor is switched off. When the tractor is running there appears to be a hissing sound coming from below the seat but upon inspection I cannot find any leaking hydraulic oil and don't appear to be losing any oil at the gauge. Any help would be greatly appreciated!!!