PC 557 Question

I have a Type II 557 that has a dull blade. I did some work recently with Brazilian cherry that was as hard as any wood I have ever encountered. and now the blade has trouble cutting soft pine. Q. Can these blades be sharpened? Q2. Can I do this with a diamond stone, as this does not seem to be as critical as, say a router bit?
BTW, anyone who buys a 557 should remove the blade and coat the threads with antiseize compound. DAMHIKT
Don Sforza
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I'd expect any sharpening service that can handle table saw blades would be able to sharpen it. You could probably touch it up with a diamond slip stone on the face that is radial to the blade, but I'd just send it out.
Bob S
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