It has been a couple years now so my memory is fading, but I had more generator issues on my 318. I had it pulled twice, 2 years in a row which meant pulling the starboard engine each time. The first year it was an oil leak on the front main seal, it was installed crooked from the factory.
The next season I didn't have any oil leak, but it developed a no start issue, it would start 1 day and seem to run fine, the next day it would crank, 3 or 5 times then fault out, I would reset and try again to no avail. One week, after not starting on the weekend, I had my wife stop at the boat everyday and try and start the dang thing. Monday - Thursday it started each time. Only running a few minutes, Friday when we got to the boat it wouldn't start and didn't all weekend
I forgot what codes I was getting, but had both fuel pumps, the injector and the anti siphon valve changed, nothing. Finally over the next winter they pulled it again and pulled the heads off the engine. Burnt valves and valve seats. They replaced the valves and had the heads machined and the damn thing purred like a kitten after that. There is a maintenance point about checking adjustment on the vales I believe at 500 hours. I didn't have near that on it.
From what I've been reading online, it appears kohler may have had issues with the Kawasaki motor in that model.
I hope yours doesn't have the same issue, but a compression check will tell the story.
Also while I had it out the second time, I had them cut an access hatch in the bulkhead. It was a sealed hatch behind the upholstered panel in the aft. Made it way easier to change plugs, and if a starter had to be replaced you don't have to pull the generator to get to it.
From what I see the uu code is an under voltage code, which stands to reason if the motor won't come upto speed.
Good luck
_________________ Jeff '14 Cruisers 380 Express "Simon Sez" Merc 8.2 Mag MPI 380 DTS B3X, (x2) Axius Premier (SOLD) '08 V318 Merc 350 Mag MPI 300 DTS Seacore, B3 (x2) 
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