I have model FDB1500LFS0
Frigidaire dishwasher and it appears that a similar issue
may be at play. I was able to remove the gasket by gently pulling it out by hand (no screws involved). The gasket is split on one end; looks like the hinge may have snagged it. On the other end the gasket was partly curled under itself. Getting ready to order a new gasket, will let you know how it goes. When I removed the gasket, I marked the front/top and left with a sharpie as a reminder of which way the new gasket will go in.