Coolant dripping from Thermostat housing to piston cooling jet - easily accessible?

HI i had previously posted about getting loads of shirt circuits so put my Disco in to JLR to get it diagnosed and they are saying they want £1,325 to fix it. Error is "vehicle in restricted performance mode. fuse 11e blown due to coolant dripping from thermostat housing to piston cooling jet. requires 10 amp fuse, thermostat housing and piston cooling jet. Are these things easily accessible and replaceable or does the car need to be on the big lift to get to them please?

Sorry shoulda mentioned its a Land Rover Discovery Sport 2018/2019 and recently had the DPF replaced and i am wondering if that work could have caused this fault so i can get them to fix it since they caused it maybe?