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The other day I went to adjust balance while holding down the damper pedal, and now the left range of the balance knob (7-12 o'clock) seems to control volume, while the right range (12-5 o'clock) does nothing at all. Does anybody know what happened and how to fix it? I can't find this in the manual, and factory reset did nothing.
Thanks in advance.

It sounds like you have one channel faulty (probably the left side). If one channel in a stereo mix goes down, the balance control would act like a volume control on the side that has the problem. If the sound decreases as you turn from the 12 o'clock position towards 7 o'clock on the left side, that would support this theory. It could be a speaker connection or a problem in the amp stage. Have you had a problem with the headphone connector recently, or any crackling sounds from the speakers?

If it's not something obvious, I would think you might need to call a service center.

Good luck.

Try using contact cleaner to clean the output jacks. On most keyboards, one of these is a switching jack. When no plug in in the jack, the switch closes and the sound collapses to mono on the other jack. It's a pretty small contact and it doesn't take much to keep it from closing correctly and blocking the signal from one side of the stereo signal.

It can't hurt and it might help. Contact Cleaner can be found at radio shack. You want the kind that DOESN'T leave a lubricating residue.

When you use it, use short bursts (1-3 seconds) and jack the plug in and out a few times (like it was your girlfriend) to "exercise" the switch and allow the cleaner to get into the switch that's part of the jack assembly.

Voxpops - no previous problems, one moment it was fine, the next the balance control was gone.
KrAYZEE - i'm not sure i understand the normal function of the switching jack.. could you explain? I have some isopropyl alcohol, so I'll give that a try before calling the center.

Don't clean the jack. Instead, try to determine if the connector has a problem or not. If you "jiggle" the plug, does that fix the problem (even temporarily)? If not, contact cleaner will make a mess, and will solve nothing.

Isopropanol evaporates without residue, so i doubt it could hurt. So far there's been no change at all no matter what I do with the plugs. Fortunately, the piano's less than a year old, so the warranty's still kicking...

Yes, isopropanol evaporates. But you can't easily buy that. The stuff you buy at the drug store as "rubbing alcohol" is 70%-77% isopropanol. The remainder is ... water, 23%-30%. I wouldn't use it.

Anyway, if pushing and pulling the connector doesn't clear the "dirt", at least temporarily, neither will isopropanol, not even the chemist's 100% pure variety.

I'm not banking on it working, but on the off chance that it does, it would save me a lot of time. I wouldn't bother if I didn't already have it lying around, but since I do it seems silly not to try.

Oh, and the stuff I have is the 99% used for electronics work, so no worries there.