Uneven output on 1978 Rhodes

[Aububuh]

I have a 1978 Rhodes that my dad gave me a few years ago since it had been gathering dust in the garage.  Recently I've been trying to learn a bit about how to maintain and restore it, and I've had some success with cleaning out the insides and all that, but one issue eludes me.
Between the Eb and the E above middle C, the output lowers a noticeable amount.    I pulled up a diagram of how the pickups are supposed to be wired, and everything seems to be correct, so I'm stumped as to what to check next.  Can any of you help?

[Amptech]

Have you measured the distance from the end of the tine to to pickup?  Is it the same as the others, you also may have a bad pickup.  Keep me posted..

[Aububuh]

I just realized I didn't word this very well.  The output of the entire top half of the keyboard is lower than the bottom half.  It's not just the one note.  Sorry about that!  I recently adjusted the position of all the tines, but that didn't really help with this volume issue.

[Cormac Long]

Just to get a 2nd opinion on that output volume, I'd set the amp volume lower and use a screwdriver tip to tap the metal core of the pickups and try to gauge that volume difference between the pops. That should give a more accurate indicator and avoid any voicing or hammer tip variations that could be in play.

[Aububuh]

I didn't notice much sound at all, but maybe I'm tapping in the wrong place.

Also notable is that the top half of the keyboard has less low end, in addition to being quieter.  That makes me think that it's some kind of series/parallel issue, but I don't know where the problem could be.

[pnoboy]

If you have an ohmmeter, connect one end to the ground lug at the very top (treble) end of the pickups, and work your way down  to see if the resistance increases normally.  If you piano isn't older than about 1971, the pickups are paralleled in groups of 3.  I seem to recall that the pickup resistance is 180 ohms, so with each group of 3 you go away from the treble end, the resistance should increase by 60 ohms.

[Aububuh]

I'll check that out.