Unhook the cables from the actuators, and send two children into the bilge with pliers and a VHF radio.
Pliers are applied to shift cable, and ...
... "Pull" is forwards (I think).
You might laugh, but this is pretty much the emergency shift procedure from the manual in the case of actuator failure!
Ok thatnks all just thought that I read that it was adjustable. As for the second idea got the pliers but the kids could be an issue as the living acom between the 75's is not well equipped. Also getting a VHF course is for the opperators and ptoper H&S training on pliers use wiv a youf puts the cost out of reach!