I have some experience with the Nanni/Toyota marine engine
no crank issue. The three issues that I found where (1) Defective ignition switch, (2) Green crusties in and around the axillary start relay back by the bell housing, and (3) Corroded wires at the crimp terminals on the neutral safety
switch on the side of the Borg Warner Velvet drive transmission
. This was on two engines in one boat
over a 5 year period.