Northern Lights 12kW Generator shutting down

I found a hatch directly above it, never been open based on the ER ceiling insulation. MAYBE breaking it down to 2 or 3 sections it could lift out but mechanic will explore in the AM. Said typically water is either from water pump seal or exhaust gasket. The sea water pump was replaced about 10 hrs. ago so maybe the mechanic that did that job messed up.

UPDATE: Generator mechanic FINALLY showed yesterday. Removing the NL in two parts via a "hidden" hatch above it and installing a new Phaser ordered 3 weeks ago. Supposed to set up his A frame today and then off to the boat yard to grab with their lift and lower the new one.
Capt Ralph let me know if you're serious about purchasing the NL unit. No idea what caused the coolant a path to the oil. Could be simple fix; could be major.

Decided to just replace it with a new 12.5 Phaser, with Kubota engine. Awaiting mechanic to finish the job after he broke it into ER hatch size & boat yard swapped the old with the new and mechanic was gifted the old NL so someday maybe I'll learn what caused its failure. New sure looks purdy.

LOL It was actually a last-minute subject when the lift driver asked where to put the old unit. After looking into converting it to land use I gave up on that idea and faced for a quick decision at the yard asked the installer if he wanted it. In hind sight should have tried to push him to install right away but realized how warm the ER would be so just let it go. Too heavy to deal with plus no place to store and still with the coolant in oil situation.

Photo is the new Phasor that's replacing the NL. The black on the left is the fuel pump. Next is fuel filter, and all the way on the right is oil filter. All exactly as delivered; I've not changed anything. Was happy to see the oil filter in the vertical position vs. horizontal on the NL and the sea water pump on the front vs. right side as it was on the NL.