Product review (5 stars): Don't spend hundreds on a repairman, do it yourself!
We had a leak from the door so we assumed the gasket needed to be replaced.  We followed a youtube video showing how to switch this out of our washing machine.  It was a bit of a pain getting it back in (took 3 people to push it all into place using the round end of a butter knife) but now our washer doesn't leak anymore!  And it was shocking to see how gross the old one was.  There was so much gunk dried on, which must be detergent residue and lint.  If you are even remotely handy you can do it.  I'd say it took us about an hour total.