For all the have the electric engine hatches...
Yesterday I started my 300hr maintenance routine.  Changed the oil, and the raw water impellers.  While changing the impellers and inspecting all the hoses, I notices a zerk at the bottom of the cylinder right at the electric motor.  This is the pole that raises the hatch.  I didn't know it needs lubrication. I gave it a couple squirts from a grease gun and the hatch motor is quite a bit quieter.  Amazing what a bit of grease does!
I helped edit the Vista manual for Four Winns prior to it's final printing.  I didn't see any mention of any maintenance in the final printing or the draft version.
					
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Jvalich
http://www.badcock.com'04 FW 288 Vista "Mental Floss"