DEAD KEY on VOYGER XL!!!!

How? Why? HELP!

Eb abvove middle C is totally dead. No respose! What should I look for to fix it?

Power Cycle does not fix it. Master button does not fix it. It’s just dead!

OK. Parked a vacuum cleaner nozzle right under the lip of the keys and it started to work. I keep it covered when not in use. That’s a depressing thing to have happen to your most glorious instrument.