Here's another 356 access question. Some genius installed the (malfunctioning) macerator on my holding tank in the back of the port swim platform locker. Seems like the only access would be inside from the aft cabin. At the back of the aft cabin there is a long horizontal panel held in place by two barrel bolts. Not sure if it gives me the access I need because when I pull the bolts it shifts up and down a fraction but won't come off. Anyone with a 356 know a secret to opening it or getting into the locker from the rear?