I have a one piece Kohler pressure-assist toilet that is about 14 years old. Recently it started to leak from the bottom of the porcelain tank. It appears to be dripping from a metal bolt in that area. I imagine the pressurized tank or a fitting is leaking but I can't see that area when I remove the tank lid. I consider myself somewhat handy but I'm hesitant to remove the pressurized tank, since I've never worked on these toilets. Or is it even necessary to remove the tank? I know the tank has to be emptied before working on it because of the pressure. Is this a major job? Is it a D-I-Y job or shouldn't I even consider it? Any suggestions or advice is appreciated. Thanks.