Bird
Rest in Peace
Clay, try to get it as clean as possible to be sure of the source. When you say it appears to be coming from the plug, I guess you're talking about the drain plug, and I would assume the fluid has to be the hydraulic oil (transmission fluid). Have you checked the level to see how much you're losing? If you're absolutely sure it's the plug leaking, and it's tight, then I think I would take it out, clean it, and try putting it back. Of course, that either means changing the hydraulic oil or have a helper to hold his/her thumb on the hole while you clean the plug, and it'll be a messy job.
Bird
Bird