Alpha One Outdrive Vibration

[MJM]

Boat has been running perfectly, no issues.

Until today.

I'm getting a pretty strong vibration in the lower unit on occasion. It hasn't happened enough to know for sure exactly when, but it has happened when at very low throttle and turning sharply, as well as when in neutral at the dock with the lower unit all the way up. Under way seems to be fine.

Any thoughts? Any hints for things I should look at / try?

Thanks in advance!