head gasket leak?

it looks like the valve cover gasket needs to be changed

O.P. has to absolutely find the exact source - like when dripping from bottom of bell-housing and blaming rear seal - - when in fact it turns out to be way up at the VC gasket. Oil moves down almost invisibly - until you wipe area and notice residue. Just be sure of exact source - no ifs, ands or buts. Could save lots of wasted labor time and parts costs. Please post back - thanks.