Super easy to pull the deck and replace the fuel lines yourself , get the tanks polished for 400-500, then change all the fuel filters including the “Mystery Filters” and you should be good to go!
When I bought mine 265 the prior owner never used the Aux tank in 13 years! We did the above to it and they are purring like a kitten. Dealer charged me $1500 to do the filters, plugs, fluids for both engines. Mine had about 480 hrs on them. Love the motors and I burn 14-15 gal an hour at 25 knots so close to most 4 strokes