I think they’re accessed via a removable panel on the bottom of the deck…looking at the service manual (which is available for free on the internet, and if you don’t have a copy you should get it and study it, because I’m going to steer you toward that every time…) it looks like you remove the bottom panel and then there’s a retaining plate you remove and the cards unplug and slide out. Proceed at your own risk. I’m not telling you things you should do, but rather things you *can* do. I’m not responsible for any damage or negative outcome to you or your equipment. Make sure your deck is switched off and unplugged from power before opening it up and messing with it if you choose to do so.