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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.
"When we build let us think we build forever. Let it not be for present delight nor for present use alone. Let it be such work that our descendants will thank us for, and let us think, as we lay stone upon stone, that a time is to come when these stones will be held sacred because our hands have touched them, and that men will say, as they look upon the labor and wrought substance of them, "See! This our fathers did for us."
John Ruskin (1819 - 1900)
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.