[Feelin lucky]

Any suggestions on how I can access the hull under the Port Side Fuel Tank? Looking to replace the existing thru hull transducer with an updated airman chirp transducer. Manufacturer suggest Not to put anywhere near the engines due to the heat sensitivity of the Chirp transducer. I tried gaining access through the port stern side deck hatches and from the generator hatches but do not see away to get to the existing transducer located under the fuel tank.