The leak is through the lip seal. It is very clear every time the bow goes under water. It is a recurrent and frustrating problem.
I will be around this weekend if the weather is not good. Otherwise may be heading to Glaucester. When are you coming up exactly?
Let me know and I would love to chat about your experience in Santa Marta. We went by Santa Marta and Cartagena 3 years ago. No bow thruster leak but only because I had clamped the extra seal.