Ydp 223 some keys are starting to stick to on the downstroke when not struck with a perfectly vertical stroke. varying degrees of affliction. instrument 2 years old thanks for any help

Send me a picture of the keys.
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To remove keys you need to remove screws on the top row of the keys, turn over, remove circuit boards that run the length of the keyboard, remove rubber contacts. Keys will then un-clip the circuit boards hold the keys in place.

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A YDP uses the same key type as a basic Yamaha Clavinova. As you have stripped the keyboard to reveal the keys take a look at the end where the key hinges. There will be an arrow pointing to one side. You will need to remove att the screws holding the key base (black plastic ) to the wooden base. Slide the whole keyboard back a couple of inches, push down where the arrow points between the keys, the offending key will pop up. Slide forward and jiggle out. Replace key. reassemble. If the tag on the back of the old key has snapped off remove the piece of debris that might be there before refitting.

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replacement keys can be found online

http://www.beckettsmusic.co.uk/shop/scripts/prodView.asp?idproduct=17431

Yamaha YDP223 :

YAMAHA YDP 223 223C PARTS Service Manual free download schematics eeprom...

Korg i3 :

KORG I2 I3 SM Service Manual free download schematics eeprom repair info...

On SOME Yamaha pianos, there is an electrolytic capacitor 1mfd/50v that becomes leaky and causes this. On those with the particular main board the capcitor is at location C94. On other pianos there are other caps that bypass the wire from the pedals that are ceramic. Likely one of these has shorted. There is also a possibility that the pedal contact has shorted. Test for this by unplugging the pedal cable. If it still sustains, then problem is internal. Unless you are adept at electronics this is NOT a DIY repair.

The cord is the same as the standard ones used on computers and many devices. You can get one at most any computer store, but here is a HINT: You can often find them at thrift stores and computer recycling facilities.

Typically LOTS of screws... concentrate on those around the edge. USE GREAT care and force nothing when removing the cover...and great care of cables between the cover and the base. Mark the cables so you remember the direction they attach.

When you get edge screws out, then gentle lift and see where it seems to be held...

Some of these synths have 50 to take out to get apart. MOST are in plastic bosses and keep track of the size and length as you can put too long a one in the wrong place and crack the boss.

I use a compartmented plastic tray to keep the screws in order.

I wrote up and photographed for my similar YDP, see solution 2 under this post:
http://www.fixya.com/support/t8881187-1_key_not_spring

make sure that the trim (gain) isnt set too high on your keyboard's PA channel. it might just be clipping due to input levels that are too hot.