My 200 Prelude, (5 speed manual), recently developed a leak. It appears to be dripping from the trans case extension that supports the right side half shaft. I verified the fluid is definately synthetic gear oil. Seems there's a gasket between the 2 case halves and the drips appear right below what appears to be the drain plug?

Where is the fill plug? I would like to make sure the fluid is topped up before I take it to my mechanic to be checked and to avoid any possible damage.

Thanks, V1