Kohler ECV-740 oil leak

Kohler ECV-740 oil leak
 
This engine is in an eXmark E series mower
Engine model and spec number PS-ECV740-3040
We have an oil leak at the rear of the engine. I have all ready resealed the oil cooler adapter and installed new oil filter.
After removing the battery and running the engine using jumpers for power I find the oil is dripping from the bottom of the EFI unit.
Before I go any further I would like to inquire to see if anyone has had this EFI unit off their engine?
Did you find any thing that would be a source for this oil leak.?
 
Thanks
 Phil P?