You can't repair the seal, but you can replace it with a new one for under $130 if you do the replacement yourself. You can order it online
or from a local appliance shop, as prices vary slightly from place to place. I suggest www.searpartsdirect.com
as they usually have the part in stock and you can get it shipped to you anywhere in the US without having to run all around trying to find one locally, etc.
The tub gasket (door seal) is part number #WH08X10022 with a new substitution part #WH08X10036. However, since each model can be slightly different, depending on the serial number which denotes when it was manufactured, you might want to confirm that the above gasket is the correct one for your particular washing machine.
I'd suggest you call the folks at Sears Parts Direct at 1-800-252-1698 and give them your complete model number AND serial number before you start in on the repair, so you can be sure you have the correct substitution bellows gasket.
It's a relatively easy repair, all you need to do is remove the spring retaining wire around the outer edge of the bellows gasket, just peel it back at the edge to see it. Now locate the locking loop by going around the rim
. Once you find the locking loop, you can remove it using a couple pairs of small needle nose pliers as they make it easier to get off.
Once you've done that, you'll see the locking plate that holds the back side of the bellows gasket onto the outer wash tub. Remove those fasteners and you can get the bellows off and start in on putting the new bellows onto the washer, just reversing the order you used in the removal process.
Here's a line drawing that shows the exploded view of the tub section, with the gasket (item #306). Just take your time removing the old gasket so you remember what you're doing and when installing the new gasket so as not to rip or tear it in the process. I'd also suggest you let the gasket relax for a good 4-5 hours (to get the kinks and folds out of it from the packing box) before you do the installation.
Here's another link to one of my other solutions for installing a bellows gasket on a GE front loading washer that you can also review for more installation tips, etc.http://www.fixya.com/support/t2730376-need_help_in_installing_door_bellow_ge
Hope you find this Very Helpful and best regards!