Any question answered...

Anyone know much about electric pianos? the good kind

my housemate has a technics px 6 electric piano, and i spilled a glass of water on it..

it was turned on when it happened but was turned straight off

mopped it up and left it off, my housemate tried to use it this morning and the speakers crackly (least of the worries for now) and doing single notes works but multiple keys ends in bizarre results

turned back off so will leave it to dry out while we're away over christmas, but whats the chance of it being permanent?

these things are freaking expensive...

Maybe try and get some of the covers taken off to allow it to dry quicker, the water shorting across the circuit boards may be making the odd behavior but it may be possible to soak it up with cotton buds or tissue paper (make sure its switched off).
Is it covered under insurance?