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
You will have to carefully disassemble it to get at the key bed. It will then come out in one large piece. You may just have to expose the top of the key assembly to see the cause of the problem but you may also have to flip the whole thing over to get at the bottom.
Yeah, I think you can fix it but next time, choose the piano more carefully. I am sure that this site about pianos pickmypiano.com will help you to fix it and moreover, you can read tips how to escape such problems in the future. Personally, I was managed to choose the perfect instrument for me
SOURCE: Digital Piano has sticking key
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.
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