I just replaced the oil tank grommet and oil lines; upon refilling the oil I noticed oil slowly seeping from behind the oil pump attached to the mag cover as the oil drained down the 5/16" line -Apparently this was the source of my leak; I'm sure it was a good idea to replace the grommet and lines anyway.

Easy fix?
Just require replacement of the o-ring (24) as shown in the diagram below?

Thanks in advance for input.