All of the sudden, central vertical row of keys on my aluminum Apple wired keyboard is dysfunctional (6-Y-H-N). No spills, no hits, no jerks - was working in the night, put Mac to sleep, had this problem in the morning. Rebooting, attaching to other Macs, adding another keyboard in Preferences doesn't help. Is there anything else I can do other than the dishwasher method?