A piece of the rubber has come off the inside of washer and water now leaks out,

Piece of rubber WHERE? If you are referring to the rubber bellow (door seal), they will wear out with age and may become mishapened from repeated pressure from the door being closed. Over time the bellow can stretch or develop rips and tears and begin to leak. If the bellow is leaking, or no longer providing a good seal, it must be replaced. This will cause water to puddle under the front of the washer and inside the cabinet. The following link explains how to access and replace one:

http://www.fixya.com/support/r3574186-installing_a_door_bellow_on_a_front_load


Replacement parts can be purchased at any of the following websites:

searspartsdirect.com
pcappliancerepair.com
appliancepartspros.com
repairclinic.com

All these sites are reputable and have great service with competitive pricing, so shop and compare. The first three sites I listed also include helpful exploded view parts diagrams to assist you in locating and properly identifying the parts you need. If the model number is correct, the part number is 8182119.

If you are not referrig to the door bellow, or if you have questions about this repair, please post back and let me know. hope this helps you.

NOTE: If you leave the door OPEN between washes this will help prevent constant pressure on the door seal which can stretch it out of shape over time. It is also beneficial to allow the wash tub to air out to prevent mold and mildew from forming. In addition, overloading the washer can contribute to premature wear and tear on the bellow which can lead to rips, tears and possible dislodging from the bellow clamp seals. Always follow the manufacturer's recommendations for loading in your owner's manual.