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Are these ridges in the line of travel or perpendicular to the direction of travel through the planer?
The first would most likely be a nick in a blade as you said, the latter might be misalignment of the blades, that is not all the same height so that they leave a series of slight cup marks on the wood.
"It's a table saw, do you know where your fingers are?" Bob D. 2006
They're line of travel, slightly raised and a little fuzzy looking, about 1/2" apart, a few inches left of center. I assumed they were blade nicks until I changed the blades despite not finding any nicks in the old ones, and they didn't go away.
I'm going to crank the head all the way up so I can try to take a look at the rollers and blade assembly. That's all I can think of to do at this point.