With the power off, I would hop in the water and check both propellers. Would check to see if they were tight on the shaft, and if the shaft could move in and out. Also, always good to make sure the tunnel is free and clear of anything that might make the props cavitate.
I'm tired of fast moves, I've got a slow groove, on my mind.....
I want to spend some time, Not come and go in a heated rush.....
"Slow Hand" by The Pointer Sisters