John Deere 7530 Problems

We recently bought a premium John Deere 7530 in 6k hours, when I tested it at Sharmans I commented on how rough / rattling the engine was on starting and idling and they told me it’

I recently observed a steady stream of oil coming out of the brake valve on my John Deere 7530. I have bypassed the hydraulic supply hoses to prevent oil from leaking everywhere and