How hard is it to repair an Iwata?

Actually, replace the needle bearing/seal. I've been having a bear of a time getting all the paint out of the area right behind the paint cup, as paint keeps coming out of the area as I clean the brush. Before I store the thing I have to remove the needle and flush the area with thinner to make sure the area is clean of the needle will be stuck fast in about a week. Paint does not get back into the body and trigger area yet. Color changes are a PITA.