Hi Jim and welcome. I'm assuming this is slower than normal? Does the router come up to full speed when it does get going and does it have full power? Usually, if it does, then it's not the brushes. Bad brushes usually result in lower than normal speed or erratic speed and reduced power.
Like Stick has said it could be the brushes tight in the holders or the commutator. Whilst this shot is of a Makita armature it illustrates the commutator which possibly needs cleaning with some very fine abrasive paper and scraping between the Copper segments. The way we do that is to grind the teeth off an old hack saw blade level with the sides of the blade and carefully scrape slightly lower than the segments.
Dirty commutator, probably...also...make sure the springs behind the brushes are exerting enough pressure on the brushes. Some tools have very long brushes to start with...1/2" might be getting there...check specs for your brushes to make sure.
How old is the router...?
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