I think i've found my oil leak on my serp 3.9,

looks to be comming from the oil pressure relief valve plug and circlip, according to RAVE theres an o ring in behind there too.

is it just as simple as removing the circlip and plug and replacing the oring and resealing while its all in the car? or is it leaking because of a fault with the oil pump?

looks like it should be ok to do in the car, anyone else had to do one before?