Ron ... he HAS unhooked the shift cables from the motor, hasn't he banghead
That whole assembly got put in there through the cutout ... so it has to come back out. Has your uncle talked to a boat dealer mechanic (that works on the brand of motor that's on the Stratos)
I'm thinking that the control box & shift cables are a "set", and specific to the motor brand it's connected to ... so he would have to purchase a complete assembly set, as a replacement. OR ... if the shift/control box is toast, the cables are disconnected from the motor, and he still can't get the assembly out through the cutout .... then, has he tried to open the control box & disconnect the cables from inside of it, then pull the cables out through the bilge area ??
... cp