Glad that you appear to have found the cause of the oil leak. However, I'd be tempted to return it to Lucas and ask him to re seal the outter casing. If oil can leak out, it's 100% sure that rainwater + salt can leak in, and cause all sorts of electrical issues in the future. Alternatively, buy a high quality exterior silicon sealant and do the job yourself
You'll have a good idea of where the leak was coming from???
Was there much/any oil contamination on the opposite side of the DEM - where the valves are actually housed??
Cheers
Bob