Not even with a sawzall to get in???
...before I tossed it...I'd try something...
"Potted" typically means the circuit board is dipped in epoxy or a plastic substance after it's tested and connected. It's somewhere between very difficult and impossible to get the coating off without damaging the circuit board or components. It's great for water and vibration proofing but it pretty much prevents repairs to the component level.
As for marina theft, we have a problem at our marina. Understand it's primarily a drystack operation but with about 50 in water slips and perhaps twenty of these on a seasonal or annual lease.
This means that most of the people using the docks are not really "boaters", but people who own boats and have them put in the water a few weekends per year. These folks don't understand that some of us have an annual lease on a slip and may keep our hoses and electrical cords on the dock. Their assumption is that anything on the dock belongs to the marina and is there for their use. I've watched people walk around looking for a hose to wash their boat, unhook it from where it is and carry i to another slip, use it and leave it there.
In their mind they are not stealing it, they are just moving the marina's hose from one slip to another. Of course in my mind they are stealing it. Since there's no way to "educate" everyone who owns a boat at this marina, My solution is to secure the hose to the dock so it cannot be moved without a square drive screwdriver. It works and some of my slip neighbors have followed my lead.
I tried marking my hoses and electrical cords but the markings faded away pretty quickly and people don't stop to read anyway.
Another annoying thing these folks do is when they come back from a day on the water some will pull into any vacant slip thinking it like the Walmart parking lot. So far this has only happened to me once and the people were still around the boat so they moved it and I was able to back into my slip. I haven't figured out a solution for this yet.