gotta clean the leak inside the compartment and then run the slide in/out. Its likely one of three things- the solenoid(s) for extend or/(and) retract, the hose connection(s) for the extend/(retract), or the plugs/fittings on top of the manifold. Many reports of the brass hex plugs on top w/missing or broken o-rings. If the leak is new, and its coming from the top, likely the o-ring(s) broke on the brass plug(s).
A mirror on an extendable handle (along w/the flashlight) works wonders for working in a dark, small cave like this. Sears has such on the shelf.
Baja-tested '08 2-slide 36'
Alpine: The Ultimate DIY'er Project