Well, i wouldn't claim to be an hvac guy. But i have been working around refridgeration units (Industrial cold storage, large scale ice machines) most of my life. Now i am not realoy sure what you mean by inside a/c unit versus outside. Unless you are referring to the blower unit which feeds your vents.
Thing is though if something dealing with refridgeration (which most a/c units i know of run on refridgerant) is causing leaking of water, I would consider the fact that something maybe freezing up or otherwise getting cold enough to condense the moisture in the air onto the metal/surfaces of the quipment.
I might hazard a guess that you have a moisture problem in the vicinity of your equipment, and or that something is running colder than it should be. Maybe you could adjust some settings?
What you were saying wasn't really rife with details, but i hope this helps.