I completely disassembled the old Deck and following directions from the Deck forum (I think) I completely submerged the PCB in water (yes, water) and gently cleaned it. I let dry for a couple days, reassembled, crossed my fingers, plugged it back in and...it still worked just fine. I used it for a while afterward but the affected keys were still not the same (slow to retract) so I took it out of service. I still have it (Cherry blacks, btw) and maybe someday I will try to repair it again.