Fliteboard's Series 3 is an eFoil-style electric surfboard system where water sealing is everything. A mast/motor seal leak is usually repairable if caught early: replacing seals, inspecting the motor housing, and checking for saltwater corrosion can prevent a much larger failure.
Compare the cost of seal kits and professional labor (if you don't service it yourself) to the repair threshold; seal work is often the best value repair because it protects the expensive electronics and battery. Replacement becomes more reasonable when the leak has already caused controller corrosion, repeated motor faults, or battery connector damage-those can cascade into multiple high-cost modules.
Because Series 3 availability can be limited, "new price" often reflects current market purchase cost; if repair restores safe operation and you can verify dry internals afterward, it can extend useful life substantially.