i had an intermittant problem with mine, wasnt the fluid or anything like that, was me trackrod ball joints siezed, but it depends if your landy spends every other week sitting up 2 its crossmember in salt water or not :(
try giving them a clout with a hammer and see it they move, you should be able to move them by hand
also turn the steering and see if the body moves side to side over the axle, if it does it could well be your panhard bush's shot
danny