If your sound system is the same as in my 255, I assume the head unit is located in the port side tub where the drink holder is. I had mine out twice to upgrade the head unit. Taking out the tub itself is not a big deal. But getting it around the companion seat was. I had to remove the seat off its base to get the tub out. Once inside the gunwale cavity, I found the small amp. screwed to a piece of starboard which was screwed to the gunwale inside wall. If you see 2 screws with trim washers going through the wall next to your companion seat, those are the amp mounting screws. I got rid of all that factory crap and installed a new Fusion Apollo head unit into the tub. My new JL amps are now mounted to the forward inside wall of the helm console. GW is pretty good about installing enough rigging tubes to run wire. I can now service my sound system without taking the boat apart. It was alot of work but I think in the long run, worth the effort.