Toyota Repair: BAD OIL LEAK, valve cover gasket, toyota cressida

Question
I have located a bad oil leak behind the passenger side cam shaft assembly just below the valve cover. Do you know what the mechanism is there that would be leaking. I have a 1988 Toyota Cressida. What is this and is there a seal of some sort that cam be replaced?  If there is how difficult of a job is this?

Thank you,
Chad Walden  

Answer
It sounds like the valve cover gasket is leaking, the intake pipe and hoses need to come off and anything else that's in the way, then remove the phillips screws that hold the valve cover on, lift off the valve cover and replace the rubber gasket seal.