Advice needed! My Insinkerator has been fine until it recently started leaking out the right front of the front door. Have determined that it is likely the Door Seal gasket. I have found that I can order this part for around $100. Is it worth it on a machine that is 18years old which is no longer manufactured? This is the first part to go wrong but other stuff is bound to follow...On the other hand it has worked just fine...?? Help. Also, confused by what I have read...Does this machine take KA parts? Model WSSUP-2 Thanks for any advice.