Took my seat tub out for the first time last week to clean the plug. Learned an inexpensive lesson...under the seat is a plastic plug type fastener you must remove before pulling up the tub. Very easy otherwise. The 2 nuts at the front end of the seat will be the last 2 you remove, after you unhook the strut from the tub and tilt the seat forward as far as you can. Dont forget to unhook the interior light connection before pulling tub completely out.