Just following the FSM as you can't get a puller or plates behind the bearing, due to clearance, until you take some rollers out of the cone. Collar has to come off first, drill a partial depth hole in it first before the chisel and it makes it easier to split. Hopefully you don't need to do any of this, as I suspect your leakage is out the retainer to backing plate seal. New inner housing seal and new backing plate seals (metal one is housing to backing, foam backing to retainer) and then back together after a bearing clean and grease.