I've fixed a few ac systems but this one is a bit more trouble. Condensor to receiver pipe had a corrosion hole at the clamp, bought a new replacement from Honda. Recharged, high side valve didn't shut when I took the hoses off. Replaced with a new valve core from a standard repair kit, recharged, sniffer indicates leak at high side valve. Looks like gas is not leaking through the core but around it. Do I need special honda valve cores, or different o-rings? Also seemed to be some leaking at the receiver end of the new pipe, which was supplied with new o-rings. Are these common problems? Any help appreciated.