434519 seal kit. Somewhere around $ 75. Unless you have a factory service manual, you may want to have it done. You'll need a spanner wrench to get the pistons out.
I seriously doubt a map gas torch will get the big nut undone boobie, just having some fun mate.
Find the leak, if it's in the trim rams then they can be done with the assembly in place (easy) but if it's leaking in the tilt ram then the whole assembly has to come out.