The springs do get weaker over time - however for about $60 and a quart of heavier wt fork oil you can make vast improvements to the front suspension - which by design is pretty mushy.
Buy a set of Progressive Springs from Progressive Suspension, replace the current fork oil with Belray 15wt - created a nice front suspension feel.
Fork seals don't need to be replaced unless they are leaking and won't need to be touched to do the spring/oil change-over.
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