I figured it would be neat if we could get reverse going again for the coming trip! First order was to get the props as clean as possible. With Valiant swimming as my helper, Vitality pointing out which jellyfish she needed for her collection, and everyone else doing their school.
Then I had Intrepid start the engines and start shifting them from forward to reverse. Slowly it got easier and easier, and by the time we had done it 30 or so times the props were shifting smoothly! It appears that you need to "exercise" the props to maintain their shifting capabilities!
Well now we have both forward and reverse on both engines!!